A compound is made up of two or more elements which are chemically combined.
If something gains an electron it has a negative charge.
Metal+Non-metal= Ionic bonding.
Ionic compounds are held together by strong forces of attraction between oppositely charged ions.
The atoms in metals are closely packed together and arranged in regular layers.
Metallic bonding is positively charged metal ions which are held together by electrons from the outermost shell of each metal atom, These delocalised electrons are free to move throughout the giant lattice.
It takes a lot of energy to break strong ionic bonds within a giant ionic lattice. So ionic compounds have high melting and boiling points. They are solids at room temperature.
Ionic compounds conduct electricity when we melt them or they dissolve in water. That's because their ions can move freely around and carry charge through liquid.
Substances made up of simple molecules have low melting and boiling pointhave weak intermolecular forces.
Simple molecules have no overall charge, so they cannot carry electrical charge. Therefore substances made of simple molecules do not conduct electricity.