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Co-ordinate Covalent Bond or Dative Bond

We have seen that in the formation of a covalent bond between two atoms, each atom contributes one electron to the shared pair. Sometimes both the electrons of the shared pair may come from one of the atoms. The covalent bond thus formed is a co-ordinate bond or dative bond.
For example, formation of ammonium ion, hydronium ion, aluminium chloride (Al2Cl6), and nitromethane (CH3NO2).

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