Question

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Answer 1

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Answer 2

Answer:

Na2O formula of sodium oxide

AlCl₃ formula of aluminium chloride

Na2S formula of sodium sulphide

Mg(OH)2 formula of magnesium hydroxide

To write formula you just have to write their symbol and below their valency and after that cross multiply their valency with symbol. This is the easiest formula to write chemical formula of elements.

Explanation:

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