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Hydrogen forms molecular or covalent hydride (binary compound) when it reacts with p-block elements under certain conditions. For eg: H2O,H2S,NH3,CH4,B2H6,etc.
On the basis of no. of electrons in Lewis structure, these covalent hydrides are further classified into:
* Electron-deficient hydride :
# less than 8 number of electrons in Lewis structure. For eg: hydride of boron: BH3 ( 6 electrons ). Hydride of Boron actually exist as dimer in order to get stable.
#Group 13 elements form this kind of hydride.
* Electron precise hydride:
#Their octet is exactly fulfilled by 8 electrons. For eg: CH4
# Group 14 elements form these hydrides.
* Electron rich hydride :
# Their octet is filled by 8 electrons and some lone pairs can be seen in Lewis structure of these hydrides. For eg: H2O, NH3, HF,etc.
#Group 15,16,17 elements form these hydrides.
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