Answer: Option (d) is the correct answer.
Explanation:
Since the given formula is [tex]3Mg_{3}(PO_{4})_{2}[/tex]. According to cross method formula, magnesium has +2 charge so, [tex]PO_{4}[/tex] is multiplied by 2.
Thus, 1 molecule of magnesium phosphate will contain 2 atoms of phosphorus.
Therefore, three molecules of magnesium phosphate contains following number of atoms.
Hence, we can conclude that there are 6 atoms of phosphorus in three molecules of magnesium phosphate, [tex]3Mg_{3}(PO_{4})_{2}[/tex].
