Question

Why hydrogen is not reactive at normal conditions?

Answer 1

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Atomic hydrogen (H) is more reactive than molecular hydrogen H2 . Atomic hydrogen is formed by the dissociation of molecular hydrogen. Atomic hydrogen (H) has one electron in its valence shell. It will share one electron with another hydrogen to obtain noble gas electronic configuration and lead to the formation of H2 . Atomic hydrogen is very reactive and readily reacts with little amount of energy at ordinary conditions. Molecular hydrogen contains two hydrogen atoms. It is inert.ie. not reactive as H-H bond has high dissociation enthalpy . Two atoms of hydrogen combine to form molecular hydrogen by a covalent bond. Hence , molecular hydrogen is more stable than atomic hydrogen and does not react under normal conditions.

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Answer 2

Atomic hydrogen is very reactive. It combines with most elements to form hydrides (e.g., sodium hydride, NaH), and it reduces metallic oxides, a reaction that produces the metal in its elemental state. ... Almost all metals and nonmetals react with hydrogen at high temperatures.