The no.Of electrons in the outermost shell of an element is 5.What is its valency and why?
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valency is 3 as the no. of valence electron is 3 and it needs 3 more electrons to become stable
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The valence is 3 As 8-5=3
It cannot loose 5 electrons therefore it gains 3 electron to complete it's octet
And it's valence is -3
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