what is variable covalency?

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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 Is it variable valency or covalency..??

Variable Valency

  • Certain elements combine with other atoms, donating, accepting or sharing electrons in different proportions depending on the nature of the reaction. For example, iron combines with oxygen to form ferrous oxide as well as ferric oxide. In the formation of ferrous oxide, iron exhibits a valency of +2, whereas in ferric oxide, it has a valency of +3. This is termed variable valency.

Read more: What Is Variable Valency? | eHow.com http://www.ehow.com/info_11372429_variable-valency.html#ixzz2J38I5X1G

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