Valency is also the number of electrons ...

Valency is also the number of electrons - donated or accepted by an atom so as to achieve stable electronic configuration of the nearest noble gas'. With reference to this definition -
a] State what is meant by 'stable electronic configuration'.
b] State why the valency of-
(i) sodium, magnesium & aluminium is +1,+2& +3 respectively.
ii] chorine, oxygen & nitroge is: -1, -2 & -3 respectively.

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