Question

3 which of the following elements is an exception to the octet rule? a hydrogen (h) b sodium (na) c argon (ar) d none of these are exceptions

Explanation:

The Octet Rule states that atoms tend to gain, lose, or share electrons to have 8 electrons in their valence shell. Hydrogen has only 1 electron and follows the Duet Rule (aims for 2 electrons in its valence shell). Sodium loses 1 electron to achieve a stable electron configuration (but still follows the concept of having a full outer shell, just in a lower energy level). Argon has a full octet (8 valence electrons). So hydrogen is an exception.

Answer:

A. Hydrogen (H)