| Chromium is used extensively in automobile trim as chromium metal because of its shiny finish and corrosion resistance. |
Periods are the rows of the periodic table that from left to right increase in order of mass. As you go along periods the number of protons and neutrons increases and the number. Atomic Number: 24. Atomic symbol: Cr. Atomic Weight: 51.996. Electron configuration: 1s 2 2s 2 2p 6 3s 2 3p 6 3d 5 4s 1. Ionization energies: 652 kJ/mol. Pauling electronegativity: 1.6. Grey paint brush stroke. Chrome(another word for chromium when it is used in dyes or pigments) Holonyms ('atomic number 24' is a substance of.): chromite(a brownish-black mineral; the major source of chromium) Context examples. An element with atomic symbol Cr, atomic number. Relative atomic mass The mass of an atom relative to that of carbon-12. Mikroc pro for pic 2009 crack. This is approximately the sum of the number of protons and neutrons in the nucleus. Where more than one isotope exists, the value given is the abundance weighted average. Isotopes Atoms of the same element with different numbers of neutrons. Next of Atomic Number 24. Atomic Number 26: a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood. Previous of Atomic Number 24. Atomic Number 11: a silvery soft waxy metallic element of the alkali metal group; occurs abundantly in natural compounds.
Chromium
| Atomic Number: | 24 | Atomic Radius: | 189 pm (Van der Waals) |
| Atomic Symbol: | Cr | Melting Point: | 1907 °C |
| Atomic Weight: | 52.00 | Boiling Point: | 2671 °C |
| Electron Configuration: | [Ar]3d54s1 | Oxidation States: | 6, 5, 4, 3, 2, 1, −1, −2, −4 (depending on the oxidation state, an acidic, basic, or amphoteric oxide) |
History
From the Greek word chroma, color. Chromium is a steel-gray, lustrous, hard metal that takes a high polish. Discovered in 1797 by the Frenchman Louis Nicolas Vauquelin.
Sources
The principal ore is chromite, which is found in Zimbabwe, Russia, New Zealand, Turkey, Iran, Albania, Finland, Democratic Republic of Madagascar, and the Phillippines. The metal is usually produced by reducing the oxide with aluminum.
Uses
Chromium is used to harden steel, manufacture stainless steel, and form many useful alloys. It is mostly used in plating to produce a hard, beautiful surface and to prevent corrosion. Chromium gives glass an emerald green color and is widely used as a catalyst.
The refractory industry uses chromite for forming bricks and shapes, as it has a high melting point, moderate thermal expansion, and stability of crystalline structure.
Compounds
Atomic Number 24 Belongs To Which Block
All compounds of chromium are colored. Essential visuals plugin for virtual dj crack download. The most important chromates are those of sodium and potassium, the dichromates, and the potassium and ammonium chrome alums. The dichromates are used as oxidizing agents in quantitative analysis, also in tanning leather.
Other compounds are of industrial value; lead chromate is chrome yellow, a valued pigment. Chromium compounds are used in the textile industry as mordants, and by the aircraft and other industries for anodizing aluminum.
Handling
Atomic Number 12
Chromium compounds are toxic and should be handled with proper safeguards.