| To elaborate on what mwillithegenius said: Sodium and fluoride combine to form NaF instead of NaF4, magnesium hydroxide is Mg(OH)2, uranium sulfate is U(SO4)2, zinc and fluoride combine to form ZnF2, not ZnF3, aluminum sulfide is Al2S3, nitrogen chloride is NCl3, gallium hydroxide is Ga(OH)3, mangAnese sulfate is MnSO4, calcium and fluorine combine to form CaF2, not CaF3, potassium sulfide is K2S, and beryllium hydroxide is Be(OH)2 |