What is PF3 covalent or ionic?
K3P will have the highest boiling point because it's the only ionic compound in the group. Carbon dioxide becomes a gas well below zero. Water boils at 100 Celsius, PF3 is a covalent compound, and therefore will have a relatively low boiling point. K3P is the only metal-nonmetal combo, and will have the highest, because its ionic lattice structure takes a lot of energy to break up.