The formulas of two ions are shown: $^{72}_{34}X^{2-}$ and $^{74}_{34}X^{2-}$. Which statement is correct?
- AThe chemical properties of both ions are the same.
- BThe number of electrons in each ion is different.
- CThe number of neutrons in each ion is the same.
- DThe number of protons in each ion is different.