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An ion is an atom that has lost/gained electrons. For example, in acids, H+ is present, whilst in alkalis OH- is present. Atoms usually do this for ionic bonding, where the outer shells of the atoms are made to have complete (and have a therefore stable) arrangement of electrons.
And you felt the need to recite information from your year ten textbook...why?
whos i0n lol?
Nice video.
Isn't he a moderator?