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What (who) is hydride$36408$ - definition
![Metal hydrides (e.g. H<sub>2</sub>RhCl(PPh<sub>3</sub>)<sub>2</sub> derived from [[Wilkinson's catalyst]]) are intermediates in hydrogenation catalysis.](https://commons.wikimedia.org/wiki/Special:FilePath/Katalysezyklus-Wilkinson.png?width=200 "Metal hydrides (e.g. H<sub>2</sub>RhCl(PPh<sub>3</sub>)<sub>2</sub> derived from [[Wilkinson's catalyst]]) are intermediates in hydrogenation catalysis.")
![prismane]]](https://commons.wikimedia.org/wiki/Special:FilePath/Cubane-3D-vdW.png?width=200 "prismane]]")
Wikipedia
In chemistry, a hydride is formally the anion of hydrogen (H−). The term is applied loosely. At one extreme, all compounds containing covalently bound H atoms are called hydrides: water (H2O) is a hydride of oxygen, ammonia is a hydride of nitrogen, etc. For inorganic chemists, hydrides refer to compounds and ions in which hydrogen is covalently attached to a less electronegative element. In such cases, the H centre has nucleophilic character, which contrasts with the protic character of acids. The hydride anion is very rarely observed.
Almost all of the elements form binary compounds with hydrogen, the exceptions being He, Ne, Ar, Kr, Pm, Os, Ir, Rn, Fr, and Ra. Exotic molecules such as positronium hydride have also been made.
