Question

if z=5,what would be the valency of the element . also name the element

Answer 1

The valency of the element is 3 as it's electronic configuration is 2,3.
The element is Boron (B).

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Answer 2

since the atomic no. "z"=5
⇒electronic configuration=$1 s^{2} 2s ^{2} 2p^{1}$=2,3
⇒The element is Boron (B).
⇒The valency of the element is 3 since 3 electron r present in outer orbital