ionic compunds

• structural properties- 3d crystal lattice structure with alternating anions and cations regularly spaced held together by mutual electrostatic forces of attraction
• melting and boiling point-> due to strong mutual electrostatic forces of attraction between oppositely charged ions, large amt of energy required to overcome these forces. thus, extremely high melting and boiling points. usually exist as solids at rtp
• hardness-> strong forces of attraction make ionic compounds resistant to deforming. Attractive forces resist motion, thus ionic compunds are hard. When enough force is applied, ions of the same charge approach each other as ions move out of crystal lattice position. Eventually, forces of repulsion become larger than force of attraction, and structure shatters. Thus, ionic compounds are hard but brittle.
• solubility- most ionic compounds are soluble in water but insoluble in organic solvents.
• electrical conductivity- In solid state, ionic compounds cannot conduct electricity as its ions are immobile and can only vibrate about fixed positions. In aqueous or molten state, ions are mobile and can conduct electricity.