Question

the atomic number of an element X is 15. write down the electronic configuration of X
what will be the valency of X​

Answer 1

Answer:

Given :-

element X :- 15.

electronic configuration :- 1s² 2s² 2p⁶ 3s² 3p³

so,

valancy = electrons in last shell = 5

so, elements is :- phosphorus

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