Silver fluoride (AgF) is soluble whereas the AgCl,AgBr and AgI are insoluble in water. Abnormal insolubilities of AgX other than AgF are due to their high lattice energies on account of strong van der Waals' attraction between silver and halides ions in addition to electrostatic attraction between them. On the other hand in AgF due to smaller number of electrons in F−ions, the van der Waals' attraction is weak and hence, lattice energy of AgF is weak with the result it dissolves in water.