Question

question time!
__________ atoms always obey the octet rule.
o oxygen, carbon, chlorine, helium
o oxygen, fluorine, nitrogen, carbon
o hydrogen, carbon, nitrogen, oxygen
o nitrogen, oxygen, fluorine, copper

Explanation:

The octet rule states that atoms tend to gain, lose, or share electrons to have eight electrons in their outer - most shell. Oxygen, fluorine, nitrogen, and carbon always follow this rule in their common chemical bonding situations. Helium follows the duet rule (has 2 electrons in its outer shell), hydrogen follows the duet rule, and copper is a transition metal and can have variable oxidation states and does not always follow the octet rule.

Answer:

Oxygen, fluorine, nitrogen, carbon