Question

1. in writing lewis structures for molecules, what do we mean by the octet rule? why is attaining an octet of electrons important for an atom when it forms bonds to other atoms?

Explanation:

The octet rule in Lewis structures states that atoms (except H, He) tend to gain, lose, or share electrons to have 8 valence electrons (an octet), matching the electron configuration of noble gases. Attaining an octet is important because noble gas electron configurations (ns²np⁶ for main - group elements) are highly stable due to filled valence shells, minimizing electron - electron repulsions and maximizing stability in the bonded state.

Answer:

The octet rule means that atoms (except H, He) strive to have 8 valence electrons (like noble gases) when forming bonds. Attaining an octet is important as noble gas - like electron configurations (filled valence shells) are highly stable, reducing energy and increasing stability in molecules.