Chromium is a chemical element with the symbol Cr and atomic number 24. The key difference between chromium and hexavalent chromium is that chromium is a chemical element whereas hexavalent chromium is any compound having chromium in its +6 oxidation state. It occurs on Earth as the decay product of various heavier elements.

Large number of chromium [III] compounds are present, such as compound of chromium with sulfuric and hydrochloric acid. Gallium does not occur as a free element in nature, but as gallium(III) compounds in trace amounts in zinc ores and in bauxite.Germanium is a lustrous, hard, grayish-white metalloid in the carbon group, chemically similar to its group neighbors tin and silicon. In fact their absorption cross-sections are the highest among all stable isotopes.Terbium is a silvery-white, rare earth metal that is malleable, ductile, and soft enough to be cut with a knife.

Dysprosium is used for its high thermal neutron absorption cross-section in making control rods in nuclear reactors, for its high magnetic susceptibility in data storage applications.Holmium is a part of the lanthanide series, holmium is a rare-earth element. Thorium is commonly found in monazite sands (rare earth metals containing phosphate mineral).Protactinium is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic acids.Uranium is a silvery-white metal in the actinide series of the periodic table.
Chromium is used extensively in automobile trim as chromium metal because of its shiny finish and corrosion resistance. Chemically, sulfur reacts with all elements except for gold, platinum, iridium, tellurium, and the noble gases.Chlorine is a yellow-green gas at room temperature.

The first alloy used on a large scale was bronze, made of tin and copper, from as early as 3000 BC.Antimony is a lustrous gray metalloid, it is found in nature mainly as the sulfide mineral stibnite. Nickel belongs to the transition metals and is hard and ductile.Copper is a soft, malleable, and ductile metal with very high thermal and electrical conductivity.

Its density is about 70% higher than that of lead, and slightly lower than that of gold or tungsten.Neptunium metal is silvery and tarnishes when exposed to air. This Question Is About The Most Common Isotope Of Chromium, With Atomic Mass 52.

Cerium is also traditionally considered one of the rare-earth elements.Praseodymium is a soft, silvery, malleable and ductile metal, valued for its magnetic, electrical, chemical, and optical properties.

In nuclear industry gadolinium is commonly used as a neutron absorber due to very high neutron absorbtion cross-section of two isotopes 155Gd and 157Gd. Thorium is moderately hard, malleable, and has a high melting point. » Boiling Point » Melting Point » Abundant » State at STP » Discovery Year About Chromium All of its isotopes are radioactive. Although neodymium is classed as a rare earth, it is a fairly common element.Promethium is one of only two such elements that are followed in the periodic table by elements with stable forms. Atomic mass of Chromium is 51.9961 u. Caesium has physical and chemical properties similar to those of rubidium and potassium.Barium is the fifth element in group 2 and is a soft, silvery alkaline earth metal.

Chemically, indium is similar to gallium and thallium.Tin is a post-transition metal in group 14 of the periodic table. It occurs on Earth as the decay product of various heavier elements. Entire website is based on our own personal perspectives, and do not represent the views of any company of nuclear industry.Main purpose of this project is to help the public learn some interesting and important information about chemical elements, Our Website follows all legal requirements to protect your privacy. It is an extremely reactive element and a strong oxidising agent: among the elements, it has the highest electron affinity and the third-highest electronegativity, behind only oxygen and fluorine.Argon is the third-most abundant gas in the Earth’s atmosphere, at 0.934% (9340 ppmv). There are over 100 different borate minerals, but the most common are: borax, kernite, ulexite etc. Argon is mostly used as an inert shielding gas in welding and other high-temperature industrial processes where ordinarily unreactive substances become reactive; for example, an argon atmosphere is used in graphite electric furnaces to prevent the graphite from burning.Potassium was first isolated from potash, the ashes of plants, from which its name derives. At 0.099%, phosphorus is the most abundant pnictogen in the Earth’s crust.Sulfur is abundant, multivalent, and nonmetallic. Pure germanium is a semiconductor with an appearance similar to elemental silicon.Arsenic occurs in many minerals, usually in combination with sulfur and metals, but also as a pure elemental crystal.

Its monatomic form (H) is the most abundant chemical substance in the Universe, constituting roughly 75% of all baryonic mass.Helium is a chemical element with atomic number 2 which means there are 2 protons and 2 electrons in the atomic structure. Only about 5×10−8% of all matter in the universe is europium.Gadolinium belongs to a rare earth elements (it is one of a set of seventeen chemical elements in the periodic table). The standard SI unit is Since the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance, it is obvious, the density of a substance strongly depends on its atomic mass and also on If we include man made elements, the densest so far isThis website was founded as a non-profit project, build entirely by a group of nuclear engineers. Its extreme rarity in the Earth’s crust, comparable to that of platinum.Iodine is the heaviest of the stable halogens, it exists as a lustrous, purple-black metallic solid at standard conditions that sublimes readily to form a violet gas.

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