Question

What happens to metals below hydrogen in reactivity series.


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Answer 1

Explanation:

A metal below hydrogen in the reactivity series will not react with dilute acids. ... Hydrogen is always given off when a metal reacts with water, steam or a dilute acid.

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Answer 2

Although it is nonmetallic, hydrogen atoms do have some characteristics which make them behave like alkali metals in some chemical reactions.

Explanation :

Hydrogen has only 1 electron in its  orbital, so its electronic structure closely resembles that of the other alkali metals, which have a single valence electron in a  orbital.

You might argue that hydrogen is missing only one electron from having a complete valence shell, and that it should be listed in Group VII with the halogen atoms (F, Cl, Br, etc.). This would be valid, too.

However, halogens are extremely electronegative, with F leading the way, and H is not very electronegative, so its chemical properties more closely resemble the alkali metals than the halogens, even though it does not form a true metal (except perhaps at extremely high pressures).

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