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The chemical elements can be broadly divided into metals, metalloids, and nonmetals according to their shared physical and chemical properties.All elemental metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metallic elements; and have at least one basic oxide.
1 Notes. 2 References. 3 See also. Toggle the table of contents. Hardnesses of the elements (data page) ... Download as PDF; Printable version; In other projects ...
For alloys containing transition metal elements there is a difficulty in interpretation of the Hume-Rothery electron concentration rule, as the values of e/a values (number of itinerant electrons per atom) for transition metals have been quite controversial for a long time, and no satisfactory solutions have yet emerged. [9] [10]
The definition of metal includes: Post-transition metals, i.e. aluminium, gallium, indium, thallium, tin, lead, and bismuth. Metalloids, e.g. silicon, germanium, arsenic, antimony and tellurium. Homogeneous and heterogeneous solid solutions of metals, and interstitial compounds such as carbides and nitrides are excluded under this definition ...
It is a key constituent of cobalamin, also known as vitamin B 12, the primary biological reservoir of cobalt as an ultratrace element. [ 21 ] [ 22 ] Bacteria in the stomachs of ruminant animals convert cobalt salts into vitamin B 12 , a compound which can only be produced by bacteria or archaea .
As a metalloid, its chemistry is largely covalent in nature, noting it can form brittle alloys with metals, and has an extensive organometallic chemistry. Most alloys of arsenic with metals lack metallic or semimetallic conductivity. The common oxide of arsenic (As 2 O 3) is acidic but weakly amphoteric. Antimony, showing its brilliant lustre
2 Notes. 3 References. ... Download as PDF; Printable version; In other projects ... [Handbook on the chemistry and physics of rare earths, vol.12 ...
Iron has five nitrides observed at ambient conditions, Fe 2 N, Fe 3 N 4, Fe 4 N, Fe 7 N 3 and Fe 16 N 2.They are crystalline, metallic solids. Group 7 and group 8 transition metals form nitrides that decompose at relatively low temperatures—iron nitride, Fe 2 N decomposes with loss of molecular nitrogen at around 400 °C and formation of lower-nitrogen content iron nitrides.