Question

Oxygen has an atomic number of 8. The n=1 energy level has two electrons, and the n = 2 energy level has six electrons. Oxygen's valence is _______.

● +2
● -2
● +1
● -1 ​

Answer 1

● -2

Step-by-step explanation:

Oxygen needs to gain 2 more electrons to have 8 electrons in outer most shell (octet rule). Gaining electrons makes you negative thus, oxygen gains 2 electrons and has valence of -2.

Answer 2

Oxygen's valence is +2

the answer is +2

I hope this helps