Which statement concerning elements in the Periodic Table is correct?
- AA potassium ion, $\text{K}^+$, has the same electronic configuration as a chloride ion, $\text{Cl}^-$.
- BThe electronic configuration of a $\text{Ca}^{2+}$ ion is $2,8,8,2$.
- CThe halogens are in Group VI and so their atoms have six electrons in their outer shell.
- DMagnesium is in Period $3$ and so a magnesium ion, $\text{Mg}^{2+}$, has three occupied electron shells.