Hydrogen forms compounds with elements having atomic numbers 9, 11, 12 and 17. Mention their chemical formulae and compare their chemical behaviour.

Explanation

The compounds formed are hydrides of `s-` and `p-` block elements. `s-` block hydrides (`NaH` and `MgH_(2)`) are also known as salt-like or ionic hydrides. These are non-volatile and non-conducting crystalline solids. `MgH_(2)` has covalent polymer structure. `p-` block hydrides (`HF` and `HCl`) are covalent hydrides. these are volatile molecular compounds. they are electron -rich hydrides and have higher boiling points. `HF` shows high hydrogen bonding.