Ionic bonds

Metallic bond

A bond between two metals.

Rows of positive ions surrounded by a sea of delocalised electrons which are free to move.

Ionic bond

A bond between a metal and a non-metal

Covalent bond

A bond that forms when electrons are shared between non-metals

Giant structures

Billions of atoms covalently bonded together

e.g. diamond

Small molecules

Contain only a few atoms. Different molecules are held together by weak intermolecular forces

e.g. water

Large molecules

Contain many repeated units joined covalently in a chain

e.g. polymers

Ionic compounds

Giant structures of ions held together by strong electrostatic forces of attraction between oppositely charged ions

-high melting &boiling points

-large amounts of energy need to break strong bonds

-when liquid or aqueous, can conduct electricity

-ions are free to move