How to find valency number

1.	How to find valency number
Answer» We need to complete octate(8 electrons in outer orbit) of each atom to make it ion(except first five elements they need to completed duplate).Atom can release or gain only 3 electrons.e.g - magnesium(mg) whose atomic no.=12 2nd 1st and 2nd orbit is complete 3rd has just two atoms so it needs to release 2 electrons so it\'s valency is 2plus

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