These elements, along with the chemically similar elements scandium and yttrium, are often collectively known as the rare earth elements. It is fairly soft and slowly tarnishes in air. Chemistry also involves understanding the properties and interactions of individual atoms and molecules for use in larger-scale applications. Oxidation levels: Sulfur has oxidation states: -2, -1 (iron pyrite), +2, +4, +6. Sulfur in this state normally exists as ring-shaped S8 molecules. S_{8}} & {\text { C. } \ope, What is the oxidation state of sulfur in each of the following substances?a. Copperis a chemical element withatomic number29which means there are 29 protons and 29 electrons in the atomic structure. what is the oxidation state of sulfur in a disulfide. Being a typical member of the lanthanide series, europium usually assumes the oxidation state +3. Silveris a chemical element withatomic number47which means there are 47 protons and 47 electrons in the atomic structure. An element that is not combined with any other different elements has an oxidation state of 0. In nuclear industry cadmium is commonly used as a thermal neutron absorber due to very high neutron absorption cross-section of 113Cd. Thechemical symbolfor Manganese isMn. Chlorine is a yellow-green gas at room temperature. The ordering of the electrons in the ground state of multielectron atoms, starts with the lowest energy state (ground state) and moves progressively from there up the energy scale until each of the atoms electrons has been assigned a unique set of quantum numbers. Thechemical symbolfor Nobelium isNo. We have also distinguish between the possible and common oxidation states of every element. Click 'Join' if it's correct. It readily forms hard, stable carbides in alloys, and for this reason most of world production of the element (about 80%) is used in steel alloys, including high-strength alloys and superalloys. Holmium is a part of the lanthanide series, holmium is a rare-earth element. 25, not +25 For negative values do include the -sign o e.g.-25, not negative 25, 25, or . Californiumis a chemical element withatomic number98which means there are 98 protons and 98 electrons in the atomic structure. What is the oxidation state of the metal in the disulfide of Rh, Ir, Pd, Pt? At a temperature of 187 degrees: Liquid sulfur is in a viscous state and has a reddish brown color. It is obtained chiefly from the mineral cassiterite, which contains tin dioxide. Position: belongs to group VIA, period 3 in the periodic table of chemical elements. The correct answer for this question is Plus three. Goldis a chemical element withatomic number79which means there are 79 protons and 79 electrons in the atomic structure. Bismuth is a brittle metal with a silvery white color when freshly produced, but surface oxidation can give it a pink tinge. Tantalumis a chemical element withatomic number73which means there are 73 protons and 73 electrons in the atomic structure. Thechemical symbolfor Hafnium isHf. Astatineis a chemical element withatomic number85which means there are 85 protons and 85 electrons in the atomic structure. Thulium is the thirteenth and third-last element in the lanthanide series. Europium is one of the least abundant elements in the universe. Thechemical symbolfor Erbium isEr. So, we have two different sulfur environments and thus two different sulfur oxidation states. Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). Effect of temperature on the physical properties of sulfur, How to conjugate the verb Befall in English, Important applications of sulfur in industry and life, How to conjugate the verb Write in English, Is sulfur toxic? Theory & exercises of magnetization of iron and steel 100+ examples past perfect continuous easy to remember, Grapefruit peel beautifies skin 8 simple and most effective recipes, Is facial resurfacing harmful? Radon is a radioactive, colorless, odorless, tasteless noble gas. (1969), Discoverer: Scientists at Dubna, Russia (1967)/Lawrence Berkeley Laboratory (1970), Discoverer: Armbruster, Paula and Muenzenberg, Dr. Gottfried, Element Category: unknown, probably a transition metal, Discoverer: David Anderson, Ruhani Rabin, Team Updraft, Element Category: unknown, probably a post-transition metal, Discoverer: Hisinger, Wilhelm and Berzelius, Jns Jacob/Klaproth, Martin Heinrich. This problem has been solved! We also performed the CA of HMF oxidation for bare NF, which showed a very low current density, and after 106 min, the charge passed was only 258.9 C and the NMR revealed only 12% of FDCA formation, along with a large . The Lewis structures of some derivatives require either more than eight elec-trons or separation of formal charge. Lawrenciumis a chemical element withatomic number103which means there are 103 protons and 103 electrons in the atomic structure. Actinium gave the name to the actinide series, a group of 15 similar elements between actinium and lawrencium in the periodic table. What is the oxidation state of each sulfur in a disulfide bond? Tellurium is chemically related to selenium and sulfur. The sulfur oxyanions with sulfur oxidation numbers between 1 and +6 are unstable in low-temperature aqueous systems with respect to stable sulfide, sulfate and sulfur (Fig. 113Cd has specific absorption cross-section. Leadis a chemical element withatomic number82which means there are 82 protons and 82 electrons in the atomic structure. The negative effects of sulfur on the environment and people. Thechemical symbolfor Radon isRn. Sulfuris a chemical element with atomic number16which means there are 16 protons and 16 electrons in the atomic structure. The chemical properties of this silvery gray, crystalline transition metal are intermediate between rhenium and manganese. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. When sulfur is burned in air, sulfur(IV) oxide with a blue flame is obtained. Arsenic is a metalloid. Thechemical symbolfor Radium isRa. Due to the two sulfur environments, the outer thiosulfate sulfur has a different oxidation state, so we write the following equation for the oxidation states within thiosulfate: #stackrel("O atom")overbrace(3(-2)) + stackrel("inner S atom")overbrace(S_i) + stackrel("outer S atom")overbrace(S_o) = -2#. Thechemical symbolfor Copper isCu. Though sulfur and sulfate reducers can coexist, the latter can produce more sulfide. Thechemical symbolfor Xenon isXe. Pure germanium is a semiconductor with an appearance similar to elemental silicon. A Computer Science portal for geeks. disulfide S21 Increasing sulfur oxidation level Figure 10.3 The oxidation of thiols can give several possible products. (a) The ore molybdenite contains molybdenum disulfide (MoSThe first stage in the extraction of molybdenum is to roast the ore in . What is sulfur? Ethyl and methyl mecaptan: Other sulfur compounds such as ethyl and methyl mecaptan have an unpleasant odor and are used as a gas odorant to detect leaks. In the laboratory, sulfur is prepared by: Reacting a sulfite salt (a salt of a weak acid) with a stronger acid (usually a solution of sulfuric acid with sodium sulfite) according to the following procedure: Slowly pour the sulfuric acid solution into the flask containing sodium sulfite, then close the lid according to the equation: H2SO4 + Na2SO3 Na2SO4 + SO2 + H2O (condition: heating). Solubility: Sulfur is insoluble in water but soluble in carbon disulfideand other non-polar solvents. Other oxides are made by roasting sulfide ores inair, producing sulfur dioxide as a by-product. Iodineis a chemical element withatomic number53which means there are 53 protons and 53 electrons in the atomic structure. Our Privacy Policy is a legal statement that explains what kind of information about you we collect, when you visit our Website. Typical: Headache: SO2 will enter the body and then enter the blood and affect the nervous system when people inhale them. Thechemical symbolfor Californium isCf. Chlorineis a chemical element withatomic number17which means there are 17 protons and 17 electrons in the atomic structure. Hafnium is a lustrous, silvery gray, tetravalent transition metal, hafnium chemically resembles zirconium and is found in many zirconium minerals. Discoverer: Priestley, Joseph and Scheele, Carl Wilhelm, Discoverer: Ramsay, William and Travers, Morris, Discoverer: Ramsay, Sir William and Strutt, John (Lord Rayleigh), Discoverer: Del Rio, Andrs Manuel (1801) and Sefstrm, Nils Gabriel (1830), Discoverer: Lecoq de Boisbaudran, Paul-mile, Discoverer: Ramsay, Sir William and Travers, Morris, Discoverer: Bunsen, Robert Wilhelm and Kirchhoff, Gustav Robert, Discoverer: Perrier, Carlo and Segr, Emilio, Discoverer: Reich, Ferdinand and Richter, Hieronymus, Discoverer: Mller von Reichenstein, Franz Joseph, Discoverer: Ramsay, William and Travers, Morris William, Discoverer: Kirchhoff, Gustav and Bunsen, Robert. Is chlorine liquefaction a chlorination process? Featuring sulfur in the +4 oxidation state, sulfur dioxide is a reducing agent. Thechemical symbolfor Boron isB. Thus, the answer is that the oxidation number of sulfur in sulfate ion . and Gay-Lussac, L.-J. The Cookies Statement is part of our Privacy Policy. (415) 895-7115 Increase cash app bitcoin withdrawal limit, 1(415) 895-7115 Cash App Bitcoin verification. For example: Sulfur cream, lotion, ointment or soap used to treat acne, sulfur ointment used to treat seborrheic dermatitis, scabies, etc. Plutonium is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, and forms a dull coating when oxidized. (Photo: Internet Collection). Bariumis a chemical element withatomic number56which means there are 56 protons and 56 electrons in the atomic structure. Most elements have more than one possible oxidation state. Therefore, the inner sulfur oxidation state is: Since the tetrathionate ion is symmetric about the cleavage line we just drew, we have found the two sulfur oxidation states: 5071 views Thechemical symbolfor Argon isAr. Sulfuris a chemical element withatomic number16which means there are 16 protons and 16 electrons in the atomic structure. Osmium is a hard, brittle, bluish-white transition metal in the platinum group that is found as a trace element in alloys, mostly in platinum ores. Naturally occurring potassium is composed of three isotopes, of which 40K is radioactive. Berkelium is a member of the actinide and transuranium element series. Approximately 6070% of thallium production is used in the electronics industry. This causes people who inhale sulfur to narrow their vocal cords, making it difficult to breathe. We had to calculate the whole from this weekend. The current IUPAC Gold Book definition of oxidation state is: Oxidation state of an atom is the charge of this atom after ionic approximation of its heteronuclear bonds. Thalliumis a chemical element withatomic number81which means there are 81 protons and 81 electrons in the atomic structure. It is interesting to note that mercury reacts with sulfur at room temperature according to the equation: Hg + S HgS. Electron Configuration Aluminium is a silvery-white, soft, nonmagnetic, ductile metal in the boron group. It is the eponym of the lanthanide series, a group of 15 similar elements between lanthanum and lutetium in the periodic table, of which lanthanum is the first and the prototype. Thechemical symbolfor Chromium isCr. Thechemical symbolfor Thallium isTl. Siliconis a chemical element withatomic number14which means there are 14 protons and 14 electrons in the atomic structure. Then, they enter through the lungs and cause various lung diseases including bronchitis. Mendeleviumis a chemical element withatomic number101which means there are 101 protons and 101 electrons in the atomic structure. Antimonyis a chemical element withatomic number51which means there are 51 protons and 51 electrons in the atomic structure. These two allotropes differ in crystal structure and some physical properties, but have similar chemical properties. What is the oxidation state of molybdenum in MoO42-? Discoverer: Scientists at Dubna, Russia (1964)/Albert Ghiorso et. Answer (1 of 2): The answer is -2, which is the lowest possible oxidation number of sulfur in compound formation. Thechemical symbolfor Gallium isGa. Gallium has similarities to the other metals of the group, aluminium, indium, and thallium. The oxidation state of the sulfur is +4. 1.Introduction. Nitrogenis a chemical element withatomic number7which means there are 7 protons and 7 electrons in the atomic structure. Elemental sulfur is a bright yellow crystalline solid at room temperature. You wrote the formula for the ion as SO2^3-. 17 The behaviour of metals and semiconductors usually discussed in torms b, Proteins found in humans are polymers that consist of different combinations, An achiral stereoisomer of 3,4-dimethyl hexane isCHzCHaCHzCHzCHz, Use the dropdown boxes below to complete the statement: The figure below sho, What is the formula of iodous acid?HIOHIO2HIO3HIHIO4, Peroxynitrite (ONOOH) is molecule made bY macrophages kill invading bacteria. Of . This type of mesh has the effect of preventing the flame from gathering in one place and breaking the flask when the solution is heated. Here we report the use of pre-lithiated metallic 1T phase two-dimensional (2D) molybdenum disulfide (Li x MoS 2) as a sulfur host material for high-performance Li-S batteries under lean . Sodiumis a chemical element withatomic number11which means there are 11 protons and 11 electrons in the atomic structure. Thechemical symbolfor Beryllium isBe. But but in Vietnam, the amount of sulfur used is many times higher than the allowed level. living. Titanium is resistant to corrosion in sea water, aqua regia, and chlorine. Follow. Thechemical symbolfor Sulfur isS. Sulfur is abundant, multivalent, and nonmetallic. Thechemical symbolfor Palladium isPd. Discoverer: Davy, Sir H. and Thnard, L.-J. Palladium, platinum, rhodium, ruthenium, iridium and osmium form a group of elements referred to as the platinum group metals (PGMs). Thechemical symbolfor Protactinium isPa. Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids. Thorium metal is silvery and tarnishes black when exposed to air, forming the dioxide. The electron configuration can be visualized as the core electrons, equivalent to thenoble gasof the preceding period, and the valence electrons (e.g. Scandium is a silvery-white metallic d-block element, it has historically been sometimes classified as a rare-earth element, together with yttrium and the lanthanides. Zirconium is a lustrous, grey-white, strong transition metal that resembles hafnium and, to a lesser extent, titanium. Thechemical symbolfor Titanium isTi. However it does not include massless particles such as photons, or other energy phenomena or waves such as light or sound. The chemical symbol for Helium is He. It is a colorless, odorless, tasteless, non-toxic, inert, monatomic gas, the first in the noble gas group in the periodic table. The viscosity of sulfur increases with temperature due to the formation of polymer chains. Thorium is moderately hard, malleable, and has a high melting point. Thechemical symbolfor Cobalt isCo. Cobalt is found in the Earths crust only in chemically combined form, save for small deposits found in alloys of natural meteoric iron. Lets find out the specific properties and most common applications of this popular substance. For sulfur medicine, you need to store it at room temperature, avoid moisture and avoid sunlight, absolutely do not store sulfur in the bathroom or freezer. Now if I tried using oxygen as the x it would become: In chemistry and physics, matter is any substance that has mass and takes up space by having volume. Besides, some other important compounds of sulfur can be mentioned as: Sulfite (SO32-), salts of sulfuric acid, H2SO3, sulfuric acid and corresponding sulfites, pyrosulfite ion, metabisulfite (S2O52). Sulfur (also known as sulfur, sulfur or brimstone) is a chemical element in the periodic table with the symbol S and atomic number 16. Carbonis a chemical element withatomic number6which means there are 6 protons and 6 electrons in the atomic structure. Tantalum is a rare, hard, blue-gray, lustrous transition metal that is highly corrosion-resistant. When it burns, it produces a blue flame and emits sulfur dioxide an unusually suffocating odor. It is the fourth most common element in the Earths crust. How do oxidation numbers vary with the periodic table? Indium is a post-transition metal that makes up 0.21 parts per million of the Earths crust. Oxygen is a colourless, odourless reactive gas, the chemical element of atomic number 8 and the life-supporting component of the air. Disulfide bonds are also formed within and between protamines in the sperm chromatin of many mammalian species. Due to its flammable nature, sulfur is also used in the manufacture of matches, gunpowder, explosives as well as fireworks. Elemental rubidium is highly reactive, with properties similar to those of other alkali metals, including rapid oxidation in air. Chromium is a steely-grey, lustrous, hard and brittle metal4 which takes a high polish, resists tarnishing, and has a high melting point. Thechemical symbolfor Holmium isHo. All of its isotopes are radioactive. Thechemical symbolfor Hydrogen isH. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. At a temperature of 445 degrees: Sulfur boils, the sulfur molecules are broken down into many small molecules that evaporate. Thechemical symbolfor Aluminum isAl. Holmiumis a chemical element withatomic number67which means there are 67 protons and 67 electrons in the atomic structure. Significant concentrations of boron occur on the Earth in compounds known as the borate minerals. Helium - Electron Configuration and Oxidation States - He, Hydrogen - Electron Configuration and Oxidation States - H, Neon - Electron Configuration and Oxidation States - Ne, Phosphorus - Electron Configuration and Oxidation States - P, Silicon - Electron Configuration and Oxidation States - Si, Aluminium - Electron Configuration and Oxidation States - Al, Phosphorus Electron Configuration and Oxidation States P, Chlorine Electron Configuration and Oxidation States Cl. Erbiumis a chemical element withatomic number68which means there are 68 protons and 68 electrons in the atomic structure. Thechemical symbolfor Barium isBa. Carbon disulfide (CS2) and carbonyl sulfide (COS) can be generated from sulfur-containing species in a combustion chamber, and thus may be present at the exhaust gas and even emitted to the . It is by mass the most common element on Earth, forming much of Earths outer and inner core. Titanium can be used in surface condensers. Terbiumis a chemical element withatomic number65which means there are 65 protons and 65 electrons in the atomic structure. Like all elements with atomic number over 100, nobelium can only be produced in particle accelerators by bombarding lighter elements with charged particles. Ceriumis a chemical element withatomic number58which means there are 58 protons and 58 electrons in the atomic structure. Kryptonis a chemical element withatomic number36which means there are 36 protons and 36 electrons in the atomic structure. Is sulfur toxic? In which of the following species does the sulfur atom have the lowest oxidation number? Observing the reaction, we see that the reaction is exothermic and occurs more strongly according to the equation: FE + S FeS (temperature conditions). Show transcribed image text Expert Answer 100% (1 rating) Two x minus six is zero. Argon is the third-most abundant gas in the Earths atmosphere, at 0.934% (9340 ppmv). Uraniumis a chemical element withatomic number92which means there are 92 protons and 92 electrons in the atomic structure. The name xenon for this gas comes from the Greek word [xenon], neuter singular form of [xenos], meaning foreign(er), strange(r), or guest. . Carbon is one of the few elements known since antiquity. Selenium is a nonmetal with properties that are intermediate between the elements above and below in the periodic table, sulfur and tellurium, and also has similarities to arsenic. Thechemical symbolfor Bismuth isBi. Knowledge of theelectron configurationof different atoms is useful in understanding the structure of the periodic table of elements. Thechemical symbolfor Ruthenium isRu. Curiumis a chemical element withatomic number96which means there are 96 protons and 96 electrons in the atomic structure. Oxygenis a chemical element withatomic number8which means there are 8 protons and 8 electrons in the atomic structure. Thechemical symbolfor Rhenium isRe. R - S - S - R . Which is exhale. Magnesiumis a chemical element withatomic number12which means there are 12 protons and 12 electrons in the atomic structure. (Photo: Internet Collection). +7. Caesium has physical and chemical properties similar to those of rubidium and potassium. Thechemical symbolfor Magnesium isMg. Magnesium is a shiny gray solid which bears a close physical resemblance to the other five elements in the second column (group 2, or alkaline earth metals) of the periodic table: all group 2 elements have the same electron configuration in the outer electron shell and a similar crystal structure. For expired medications, do not throw sulfur pills down the toilet or plumbing, consult your pharmacist or local waste disposal company for a safe way to dispose of the medication. Natural boron consists primarily of two stable isotopes, 11B (80.1%) and 10B (19.9%). Oxidation of reduced sulfur species: carbon disulfide A detailed chemical kinetic model for oxidation of CS2 has been developed, on the basis of ab initio calculations for key reactions, including CS2 + O2 and CS + O2, and data from literature. Posted on December 8, 2020 ; Posted by; Leave a comment; Posted in . Thechemical symbolfor Lead isPb. Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. Thallium is a soft gray post-transition metal is not found free in nature. . In fact their absorption cross-sections are the highest among all stable isotopes. 1(415) 895-7115 How long does verification take on Cash App Bitcoin? Actinium is a soft, silvery-white radioactive metal. Calciumis a chemical element withatomic number20which means there are 20 protons and 20 electrons in the atomic structure. It is the heaviest element that can be formed by neutron bombardment of lighter elements, and hence the last element that can be prepared in macroscopic quantities. Death: When sulfur enters the body in high concentrations, the blood is poisoned, the nervous system is affected, the lungs are affected. Hydrogen Sulfide: The main compound of sulfur is Hydrogen sulfide, which has a characteristic rotten egg odor. Abstract: A detailed chemical kinetic model for oxidation of CS2 has been developed, on the basis of ab initio calculations for key reactions, including CS2 + O2 and CS + O2, and data from literature. Config e: 1s22s22p63s23p4 with 6 outermost layers. Molybdenumis a chemical element withatomic number42which means there are 42 protons and 42 electrons in the atomic structure. (Photo: Internet Collection). Neon is a colorless, odorless, inert monatomic gas under standard conditions, with about two-thirds the density of air. In industry, 90% of sulfur is extracted through its main derivative, sulfuric acid (H2SO4), which is considered one of the most important elements used as an industrial raw material. Thechemical symbolfor Neon isNe. Rubidium is a soft, silvery-white metallic element of the alkali metal group, with an atomic mass of 85.4678. Thechemical symbolfor Lawrencium isLr. Isotopes: Sulfur has all 18 isotopes, of which 4 are stable: S32 (95.02%), S33 (0.75%), S34 (4.21%) and S36 (0.02%) ). Thechemical symbolfor Nickel isNi. Do not use cotton soaked in ammonia gas (NH3) because this is a volatile gas that makes the gas collection ineffective. Although classified as a rare earth element, samarium is the 40th most abundant element in the Earths crust and is more common than such metals as tin. Thechemical symbolfor Zinc isZn. This website was founded as a non-profit project, build entirely by a group of nuclear engineers. In nuclear industry, especially natural and artificial samarium 149 has an important impact on the operation of a nuclear reactor. 1) You may use almost everything for non-commercial and educational use. Americium is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas. Their morphologies form different crystal structures, possibly rhombohedral and single oblique S8 being the most meticulously studied crystal formations. Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. taste, multiple chemotherapy. is a rare earth element with a metallic silver luster. Cadmiumis a chemical element withatomic number48which means there are 48 protons and 48 electrons in the atomic structure. Thechemical symbolfor Calcium isCa. We don't know what that means. Polymerized sulfur nitride: Made from sulfur tetranitride S4N4 a compound that has metallic properties although does not contain any metal atoms. Iridiumis a chemical element withatomic number77which means there are 77 protons and 77 electrons in the atomic structure. View a full description of this article . Page: 6,799. Odour: Sulfur is not preferred due to its odor being quite similar to that of rotten eggs this is characteristic of hydrogen sulfide (H2S). Fermium is a member of the actinide series. Typically fish, shrimp, crabs, clams, scallops, they will be poisoned with sulfur and die mass. Arsenicis a chemical element withatomic number33which means there are 33 protons and 33 electrons in the atomic structure. Sulfur is one of the elements related to many fields in practical life, playing an important role in the world economy. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) stabilizes the free metal somewhat against further oxidation. In hydrogen sulfide and metal sufides like Na2S, CaS, Al2S3, FeS, CuS, ZnS etc. Lutetiumis a chemical element withatomic number71which means there are 71 protons and 71 electrons in the atomic structure. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. In nuclear industry boron is commonly used as a neutron absorber due to the high neutron cross-section of isotope 10B. and the term oxidation number is nearly synonymous. Lutetium is a silvery white metal, which resists corrosion in dry air, but not in moist air. It is the heaviest essential mineral nutrient. In this section, we will learn two ways to prepare sulfur by two popular methods today: in the laboratory and in industry. Each oxygen in the sulfite ion is in the -2 oxidation state. Pure radium is silvery-white alkaline earth metal. Sulfur also shows its role in medicine. When we solve for X, we'll get four and 10. Thin copper filaments can burn in sulfur to produce black CuS. Niobiumis a chemical element withatomic number41which means there are 41 protons and 41 electrons in the atomic structure. Sulfur is a chemical element with atomic number 16 which means there are 16 protons and 16 electrons in the atomic structure. Mercuryis a chemical element withatomic number80which means there are 80 protons and 80 electrons in the atomic structure. Promethiumis a chemical element withatomic number61which means there are 61 protons and 61 electrons in the atomic structure. Sodium dithionite, Na2S2O4 made from hyposulfuric acid/dithionine. Cadmium is a soft, bluish-white metal is chemically similar to the two other stable metals in group 12, zinc and mercury. al. 25, not twenty five, or 2.5x101, or 0.25e2 For positive values do not include the + sign o e.g. Tinis a chemical element withatomic number50which means there are 50 protons and 50 electrons in the atomic structure.

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