Wikipedia: Ionic bond

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Ionic bonding is the process of two or more atoms losing or gaining electrons to become charged ions. The charged ions are then attracted to each other:

  Na⁺ +  Cl^-7 ->  [Na]⁺ + [Cl]^-

This type of bonding occurs between metals and non-metals?. This only occurs if the overall energy change for the reaction is favourable. The larger the difference in electronegativity then the stronger the bond.