Ba3PO4 is not neutral, it is positive. (NH4)2SO4 is neutral, the charges cancel.
Mg2OH is not neutral, it is positive. LiF2 is not neutral, it is negative. CaOH is not neutral, it is positive. The answer is (NH4)2SO4, correct ions will have a neutral charge.
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54 protons.
An ion with a charge of 3+ means it has lost electrons to become a cation. Since the number of protons and the number of electrons are the same in an atom, add 3 to 51 to find the number of protons.
No. of protons = 51 + 3 = 54
