Ionic Bonding
Ionic bonds are form between a metal to a non- metal.
Electrons are transferred forming ions.
These exert an electrostatic force of attraction on each other.

Formation of ionic bonds
Ions are formed by the loss or gain of electrons.
When an atom forms an ion, the electron structure becomes that of the noble gas closest to it.
Ions tend to be stable like noble gasses and do not react with other molecules.

Formation of an ionic crystal lattice
Formation of positive ions are always coupled with the formation of negative ions.
Metal lose electrons forming positive ions, non-metals gain these electrons forming negative ions.
The positive metal ions then attract the negative non-metal ions forming ionic bonds.

Ion Pairs
A pair of ions that bond do not form a molecule but an ion pair.
They form compounds made up of ion-pairs.

Ionic Bonds between metal atoms and compound ions
Compound or polyatomic ions form stable groups of atoms which carry a charge.
Groups of atoms as a whole acts as charged particles in forming an ionic compound with an oppositely charged ion.

Relative Formula Mass of an ionic compound
The relative formula mass is equal to the sum of the relative atomic masses of atoms in the chemical formula.
****Just add all the relative atomic masses for the atoms that make up formula of compound*****
E.g. calculate relative formula mass of aluminum sulfide (Al2S3)

	Created by mossrobyn about 11 years ago

physics (Modules 1: Matter and Material) Note on Chemical Bonding, created by mossrobyn on 02/10/2013.