Statement-1: Molecular species like ${\mathrm{SF}}_6,{\mathrm{PF}}_5,{\mathrm{I}}_3$ and ${\mathrm{XeF}}_2$ violate the octet rule

Statement-2: Compounds with an expanded octet are called hypervalent compounds.

The centre atom in ${\mathrm{PF}}_5,{\mathrm{SF}}_6$ and ${\mathrm{H}}_2{\mathrm{SO}}_4$possesses more than eight valence electrons, resulting in enlarged octet. This is achievable owing to the availability of 3d orbitals.
Elements in and beyond the third period of the periodic table do not obey the octet rule, hence it only applies to elements in the second period of the periodic table.