How many electrons are in the outermost principal energy level of an atom of carbon in the ground state

four electrons

Explanation:

Let us attempt to write the electronic configuration of carbon in the ground state. This electronic configuration will now be;

C- 1s2 2s2 2p2

The outermost principal energy level of carbon is the n=2 level which houses the 2s2 and 2p2, making a total of four electrons in the outermost principal energy level of an atom of carbon in the ground state.

d

explanation:

rutherford's experiment showed that the atom does not contain a uniform distribution of charge.