How to remember valency of elements, Chemistry

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Till 20elememts write the no of electrons in outermost shell.if less than 4 then this is the valency otherwise subtract from 8


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How to remember valency of elements, Till 20elememts write the no of electr...

Till 20elememts write the no of electrons in outermost shell.if less than 4 then this is the valency otherwise subtract from 8

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