# How many electrons are there in carbonate ion, CO_3^(2-)?

The carbonate dianion is $C {O}_{3}^{2 -}$
Now, clearly, the ion must contain 2 more electrons, than it does nucular charges.....in one formula unit of $C {O}_{3}^{2 -}$ there are ${6}_{C} + 3 \times {8}_{O} = 30 \cdot \text{positively charged nuclear particles}$. And thus there MUST be 32 electrons conceived to whizz about the nuclei.
And their presence is clear from the Lewis structure of carbonate anion.....there are 8 inner core electrons, i.e. formally the $1 {s}^{2}$ electrons, and for $O = C {\left(- {O}^{-}\right)}_{2}$ there 24 electrons (i.e. 12 electron pairs) involved in bonding or present as lone pairs. Thirty-two electrons as required.