1)Which of the following violates the octet rule ? KCl ICl4 SiF4 2)Read the following statements. Which ones are correct?

1)Which of the following violates the octet rule?

1.  KCl 
2.  ICl4−
3. SiF4

2)Read the following statements. Which ones are correct? Be sure to explain how you know. 

1. BF3 and PF5 are examples of violations of the octet rule.
2. BF4− and BF3-NH3 are examples of violations of the octet rule.
3. Expanded valence shells occur most often when the central atom is bonded to a small, electronegative element.
4. The central atoms most capable of having expanded valence shells come from rows 3, 4, and 5 of the periodic table.