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Ion


This is an atom or combined group of atoms that is electrically charged. There are positive and negative ions.

Examples: Sodium ion (Na+)

Magnesium ion (Mg2+)

Iron (III) ions (Fe3+)

Hydroxyl ion (OH-)

Nitrate ion (NO3-)

Hydrogencarbonate ion (HCO3-)

Oxide ion (O2-)

Carbonate ion (CO32-)

Sulphate ion (SO42-)


An ion is either positive (metallic) or negative (non-metallic), stable or unstable, coloured or colourless.