Question

which pairs of elements do not have to satisfy the octet rule for stability?
potassium (k) and sodium (na)
neon (ne) and argon (ar)
oxygen (o) and fluorine (f)
helium (he) and hydrogen (h)

Explanation:

Helium has 2 electrons in its outer - shell and hydrogen has 1 electron. They follow the duet rule (for hydrogen to have 2 electrons like helium's stable configuration), not the octet rule. Potassium and sodium are metals that form ions by losing electrons following the octet rule in their ionic compounds. Neon and argon are noble gases with a full octet. Oxygen and fluorine form compounds by sharing or gaining electrons to achieve an octet.

Answer:

helium (He) and hydrogen (H)