Question

which compound is an exception to the octet rule?
o h₂o
o hcl
o ccl₄
o clf₃

Explanation:

The octet rule states that atoms tend to combine in such a way that they each have eight electrons in their valence shells. In $H_2O$, $HCl$, and $CCl_4$, the atoms follow the octet rule. However, in $ClF_3$, chlorine has an expanded octet with 10 electrons around it due to its use of d - orbitals, making it an exception to the octet rule.

Answer:

D. $ClF_3$