An ion is an electrically charged atom or a group of atoms that are formed by the loss or gain of electrons.
- This loss or gain of electrons leave a full outer shell of electrons.
- The electronic structure of an ion will be the same as that of a noble gas – such as Helium, Neon and Argon.
Ionisation of metals and non-metals:
- Metals: They will lose electrons to another atom and become positively charged ions
- Non-metals: They will gain electrons from another atom to become negatively charged ions