The ratio of metal atoms to total number of constituents in magnesium phosphate is:

3 : 13

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3 : 7

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2 : 7

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2 : 11

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Solution

The correct option is A 3 : 13
The chemical formula for magnesium phosphate can be written as; $M g_{3} (P O_{4})_{2}$ . Thus the number of magnesium atoms is 3 and total number of constituents is 3+10 = 13. Therefore the ratio of magnesium metal atoms to total number of constituents in magnesium phosphate is 3:13.

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