how to find valency of a …
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Posted by Kayyum Uddin 8 years, 11 months ago
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Abhishek Bhadra 8 years, 11 months ago
It is equal to the number of electrons in the outermost shell provided when the number is 4 or less.
So first of all, find the number of valence electrons.if the number is 4 or less than 4 then it is its valency.
If not then subtract the number of valence electrons from 8, you will get the result.
example: helium - number of electrons in the outermost shell is 2 ,so the valency is +2.
chlorine - number of electrons in the outermost shell is 7, so the valency is (8-7=) -1.since it is obtained after subtracting from 8.
hydrogen - number of electrons in the outermost shell is 1,so the valency is +1.
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