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Calculate the ratio by number of atoms for Magnesium sulphide. 

[Atomic mass of Mg => 24, S => 32]

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Atomic mass of Mg = 24 

Atomic mass of S = 32 

Ratio of Mg and S in Magnesium sulphide = 24:32 = 3:4 

Mass ratio / Atomic mass of Magnesium (Mg) = 3 24 = 1 8 

Mass ratio / Atomic mass of Sulphur (S) = 4/ 32 = 1/ 8 

Hence, ratio of atoms in Magnesium sulphide (MgS) = 1/ 8 : 1 /8 or 1 : 1.

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