Select all the true statements.

The $K^{+}$ion is formed when a potassium atom loses one electron.

The $C{u}^{+}$and $C{u}^{2+}$ ions have the same number of electrons.

Anions carry a positive charge.

The $C{l}^{-}$and $B{r}^{-}$ions have the same number of electrons.

When an atom gains an electron, it becomes a cation.

The $F{e}^{2+}$ and $F{e}^{3+}$ ions have the same number of protons.