Question

what is variable covalency? Give example​

Answer 1

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Variable covalency refers the tendency of certain atoms to show different covalencies as a result of excitation of the atom. In the atoms that exhibit variable covalency the number of unpaired electrons increases as a result of excitation of the atom that causes it to have variable covalency. 

For example chlorine by absorbing a certain amount of energy moves in to the excited state with 3, 5 and 7 unpaired electrons and thus show a variable covalency of 3, 5 and 7.

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Answer 2

Explanation:

Variable covalency refers the tendency of certain atoms to show different covalencies as a result of excitation of the atom.

For example chlorine by absorbing a certain amount of energy moves in to the excited state with 3, 5 and 7 unpaired electrons and thus show a variable covalency