What is the charge on the cation An+ in a cubic lattice with XO₄- ions?

In order to determine the charge on the cation An+ in a cubic lattice with XO₄- ions, it is essential to consider the balance of charges within the lattice structure.

In this case, the XO₄- ion has a charge of -4. In order to maintain electrical neutrality in the lattice, the total positive charge contributed by the cation An+ must balance out the negative charge from the XO₄- ions.

If we denote the charge on cation An+ as n+, where n is the charge, the relationship can be expressed as follows:

Total charge contributed by An+ = Total charge contributed by XO₄- ions

n+ = 4 (from XO₄-)

To achieve neutrality, multiple cations may be needed to balance the single XO₄- ion, depending on the specific crystal structure and stoichiometry of the lattice. Given that a single XO₄- ion has a significant negative charge of -4, a cation with a charge of +4 would efficiently neutralize that charge, ensuring stability and balance in the lattice.

Thus, the charge of the cation An+ is confirmed to be +4, making this the correct answer. Understanding charge balance is