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Allotropes of Phosphorus

When alkaline...

Question

When alkaline earth metals react with phosphorous, then how many phosphorus atom(s) is/are present in product side ?

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Solution

When alkaline earth metals react with phosphorous, then two phosphorus atoms are present in product side.
$3 M + 2 P \to M_{3} P_{2}$
Thus magnesium reacts with phosphorus to form magnesium phosphide $M g_{3} P_{2}$ which contains 2 phosphorus atoms.

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Allotropes of Phosphorus

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