Use the periodic table and the above figure.
how many electrons does a carbon atom have?

12
4
6

6

Explanation:

Carbon is the 6th element of the periodic table and the atomic number is the same as the amount of electrons it has.

4

Explanation:

observing the electronic configuration for the Carbon atom shown in the periodic table:

[He] 2s² 2p²

Therefore, it can be seen that at level s and level p it has two electrons per level to form chemical bonds, which gives it a total of 4 available electrons.