What is an ion? How is an ion formed?

Asked by  | 1st Oct, 2008, 02:53: PM

Expert Answer:

An ion is an atom or molecule which has lost or gained one or more valence electrons, giving it a positive or negative electrical charge.Ions can also comprise more than one atom and are then called polyatomic ions. For example, the ammonium ion (NH4+) carries a positive charge and is composed of one nitrogen atom and four hydrogen atoms

An positive ion (cation) is formed by removing electron(s) from an atom or group of atoms.
A negative ion (anion) is formed by gaining electron(s) an atom or group of atoms.

Answered by  | 7th Oct, 2008, 08:00: AM

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