【 】How many lone pairs are on the central atom in BCl3?
Answer: There is no lone pairs of electrons on the central atom boron in BCl3. Explanation: The boron has three valence electrons and the chlorine atom has seven valence electrons. B -->3 Cl -->7 ×3 =21 -------------------- BCl3 =24 Valence electrons Now draw the best lewis structure for BCl3. Best Lewis Dot Structure for BCl3 This is the best Lewis dot structure for BCl3.From here,we see that the central atom boron does not have any lone pairs of electrons and it has six valence electrons.Having six valence electrons is not normal.Thus boron violates the octet rule.