Which electron configuration represents an atom in an excited state? a) 2-2 b) 2-8 c) 2-8-1 d) 2-2-1

The answer is D) 2-2-1

Explanation: Just trying to help out :))

answer:

the answer is 6 valence electrons.

explanation:

valence is the # of electrons on the outer most shell of an atom.

oxygen has 6.

although, the valency of oxygen is 2, because it only needs to make 2 covalent bonds, or gain 2 electrons, to achieve the stable octet configuration of a noble gas.

that's it!

if you need further assistance, let me know: )

~ trueboss72