# What are three examples of polyatomic and monoatomic ions?

Oct 29, 2015

Monoatomic: $N {a}^{+}$, $C {l}^{-}$, $B {e}^{\text{2+}}$, ${O}^{\text{2-}}$
Polyatomic: $N {H}_{4}^{+}$, ${C}_{2} {O}_{4}^{\text{2-}}$, $B r {O}_{3}^{\text{3-}}$

#### Explanation:

Basically, monoatomic ions are elements that either lost (negative) or gain (positive) electron/s.

Polyatomic ions, on the other hand, are two or more atoms covalently bonded and have an electrical charge (due to sum total of formal charges between the atoms).

Here are some polyatomic ions for your reference.