Answer :
The relation between the valency of an element and the number of valence electrons in its atoms is that, the valency of an element is either equal to the number of valence electrons in its atom or equal to the number of electrons required to complete eight electrons in the valence shell.
No. of electrons in an atom = valency of metal.
8 are the no. of valence electron in its atom = valency of non-metal.
For example- the valency of sodium metal is 1 where as the valency of chlorine non-metal is also 1.
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