An ion is an atom or a group of atoms that has an electrical charge. This charge results from the loss or gain of one or more electrons, leading to a positive charge (cation) if electrons are lost, or a negative charge (anion) if electrons are gained. The other definitions you provided are not accurate in describing an ion.
What is an ion?
It is an atom or a group of atoms that have an electrical charge.
It is an atom that can only be found in a gaseous state.
It is an atom that has the same number of electrons as it has protons.
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