Question

an element has electronic configuration 2,7 what is its valency​

Answer 1

Explanation:

The electronic configuration of chlorine can be written as 2, 8, 7. 2, 8, 7 electrons are distributed in the shells K, L, M respectively. Therefore, valence electron in chlorine is 7 and it needs to gain 1 electron from the outermost orbit to attain octet. Hence, the valency of chlorine is 1.

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Answer 2

Answer:

the electronic configuration of chlorine can be written as 2,8,7,2,8,7 electrons are distributed in the shells K,L,M respectively. therefore valence electron in chlorine is 7 and it needs to gain 1 electron from the outermost orbit to attain octet .Hence ,the valecy of chlorine is 1