Question

what is the exception to the octet rule mentioned in the text? oxygen carbon fluorine hydrogen

Explanation:

The octet rule states that atoms tend to gain, lose, or share electrons to have eight electrons in their valence shell. Hydrogen is an exception as it only needs two electrons (a duet) to achieve a stable electron configuration like the noble gas helium. Oxygen, carbon, and fluorine generally follow the octet rule.

Answer:

Hydrogen