The Data Booklet is relevant to this question. In which group do all species have the same number of electrons?
- A$\text{Co}^{2+}, \text{Co}^{3+}, \text{Co}^{4+}$
- B$\text{F}^-, \text{Br}^-, \text{Cl}^-$
- C$\text{Na}^+, \text{Mg}^{2+}, \text{Al}^{3+}$
- D$\text{K}_2\text{SO}_4, \text{K}_2\text{SeO}_4, \text{K}_2\text{TeO}_4$