One chlorine atom is covalently bonded to three fluorine atoms, and ALSO has two Lone Pairs. This gives it an expanded octet. AX2E3 for VSEPR. Check me out: www.chemistnate.com
@@chemistNATE yes sir , but we have some cases like BF3 , we have an "lacune electronic" on the B, sorry for my english i m studying it with french language