If the central atom is of third row or below this in the periodic table, then lone pair will occupy — Chemical Bonding Chemistry Question

Question

If the central atom is of third row or below this in the periodic table, then lone pair will occupy a stereochemically inactive s-orbital and bonding will be through almost pure p-orbitals and bond angles are nearly 90°, if the substituent's electronegativity value is $\le$ 2.5.