Question

How to find the valency of any substance plzzz answer

Answer 1

To find the valency of any substance or I think metal you have to see how many Valence Electrons there are in the outermost shell of the atoms of the element or substance
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Answer 2

You can determine the valency of a transitional element or a radical in a particular compound by noting how it combines with elements with known valency. This strategy is based on the octet rule, which tells us that elements and radicals combine so as to produce a stable outer shell of eight electrons.