What is the total valence electrons of CO3^-2

24

Step-by-step explanation:

Let's make a table of valence electrons and add them up.

Atom Electrons

1 C 1 * 4 = 4

3 O 3 * 6 = 18

+2e⁻ 2 = 2

TOTAL = 24

The Lewis structure below shows that there are eight electrons in covalent bonds and 16 electrons in lone pairs.