Question

how many electrons will oxygen need to gain or lose to be left with a full outer shell of valence electrons? oxygen lose 1 gain 2 lose 3 gain 4 lose 5 gain 6 lose 7 gain 8

Explanation:

Oxygen has 6 valence electrons. A full outer - shell of valence electrons has 8 electrons for elements in the second period. So, oxygen needs to gain 2 electrons to achieve a full outer - shell.

Answer:

B. gain 2