Ionic bonds are formed when a cation and an anion come together to form a molecule. A cation is an ion with a positive charge, and an anion is an ion with a negative charge. Ions of different charges are attracted to one another. the stronger the attraction between them, the higher their melting and boiling points. read more
High melting and boiling points - Ionic bonds are very strong - a lot of energy is needed to break them. So ionic compounds have high melting and boiling points. Conductive when liquid - Ions are charged particles, but ionic compounds can only conduct electricity if their ions are free to move. read more
However, its high melting points and boiling points are part of the physical properties of ionic compounds, and high heat is usually required to break the bonds of ionic compounds. The ions which are held together by strong electrostatic force of attraction may results in high melting point and boiling point. read more