The total number of donor atoms surrounding the center atom is the complex's coordination number.
The number of atoms, ions, or molecules that a central atom or ion bears in a complex or coordination compound or in a crystal as its near neighbours is known as the coordination number or ligancy.
Many of the changes you frequently notice in the environment around you are the result of uncomplicated chemical reactions that go unnoticed. An atom's coordination number for molecules and polyatomic ions is calculated by simply counting the other atoms to which it is linked (by either single or multiple bonds).
For instance, the core cation of [Cr(NH₃)₂Cl₂Br₂] is Cr³⁺., a hexacoordinate with a coordination number of 6.
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