Question

An element has atomic number 17 give electronic configuration of the element and give its valency

Answer 1

____________________________________The element has atomic number 17 is chlorine
it has electronic configuration 2,8,7
it's valency is 1 because it can gain 1 electron.
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Answer 2

Atomic number 17 that means chlorine.....

the electronic configuration of chlorine is 1s2 2s2 2p3 (2,8,7)

and it's valency is 1