The sum of the number of lone pairs of electrons present on the central atoms of BrF ₃ , IF ₅ , and SF ₄ is

Step-by-step solution

To find the number of lone pairs on the central atom, we use the formula: Number of lone pairs = Valence electrons on central atom - Number of electrons shared in bonding 2 For BrF ₃ : Central atom is Br (Group 17), which has 7 valence electrons. It forms 3 single bonds with F atoms, using 3 electrons. Remaining electrons = 7 - 3 = 4 . Number of lone pairs = 4 / 2 = 2 . For IF ₅ : Central atom is I (Group 17), which has 7 valence electrons. It forms 5 single bonds with F atoms, using 5 electrons. Remaining electron