Octet rule is not followed in

In ${\mathrm{SF}}_6-$S has total 12 electrons. Expanded octet rule by “S atom”.

In ${\mathrm{PF}}_5-$P has total 10 electrons. Expanded octet rule by “P atom”.

In ${\mathrm{BeCl}}_2-$Be has total 4 electrons. It is electron deficient molecule.

In the above three cases, octet rule (8 electrons in the valence shell) is not followed.