Atoms that have an electrical charge due to a gain or loss of electrons are called ions.
When an atoms gains or lose an electron. The atom becomes charged.
when the atom gains electron it results in negative charge.
that type of atom is known as anion.
e⁻ + cl → cl⁻
cl⁻ is called chlorine ion
when the atom loses electron it results in positive charge.
that type of atom is known as cation.
Na → Na⁺ + e
here Na⁺ is called sodium ion.
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