Question

what is difference in valencey and in valance electron ?

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Answer 1

Example in nitrogen covalency can be4 but generally it donates 3 electrons

Answer 2

valance electron are the electrons present in its outer most shell

valency is the capacity of outermost shell to keep electrons means how much electrons are left to fill she'll

valency (electrons below 4)=the number of electrons in outermost shell

valency (electrons more than 4)= 8 - no of valance electrons