Identify the correct formula for the compound formed between Mg²⁺ and PO₄³⁻ ions.
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A.
Mg₂(PO₄)₃
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B.
Mg₃(PO₄)₂
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C.
Mg(PO₄)₃
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D.
MgPO₄
Correct Answer:
B. Mg₃(PO₄)₂
Explanation:
To form a neutral ionic compound between magnesium (Mg²⁺) and phosphate (PO₄³⁻), the total positive and negative charges must balance. Magnesium has a +2 charge, while the phosphate polyatomic ion has a -3 charge. The lowest common multiple of 2 and 3 is 6. To achieve a net charge of zero, three magnesium ions (totaling +6) are required to pair with two phosphate ions (totaling -6). Therefore, the correct chemical formula is Mg₃(PO₄)₂, where the subscripts indicate the ratio of ions needed for electrical neutrality.
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