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A covalent bond is a chemical bond formed by mutual sharing of electron pairs between two atoms. A coordinate bond is a special type of covalent bond in which both the electrons of the shared pair come from one of the two combining atoms. Coordinate bond is also known as dative bond. This type of bond is always formed between two dissimilar atoms. The atom which provides the electron pair for the formation of coordinate bond is called donor. The atom or ion sharing the donated electron pair is known as the acceptor. The coordinate bond is a directional bond. A coordinate bond has properties of both covalent and ionic bonds. Therefore, it is also called as co-ionic bond. Ammonium ion and hydronium ion have coordinate bonds.

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