S2 Chemistry
S2 Chemistry. Formula. Valency. The valency of an atom is the number of links which it can form. Valency. Atoms usually have a valency of 1, 2, 3 or 4 Magnesium has a valency of 2 and can be drawn as -. Mg. Valency. Valency. Valency. Valency. Draw the valency pictures for –
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