Question 1 • AA-F26 Physical Science
The coefficient 4 multiplies every atom in the formula Na₃PO₄. One unit has 3 sodium atoms, 1 phosphorus atom, and 4 oxygen atoms, so the total is 4 × 3 = 12 sodium, 4 × 1 = 4 phosphorus, and 4 × 4 = 16 oxygen atoms. Therefore, the correct choice is 12 sodium, 4 phosphorus, and 16 oxygen.
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