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For molecules and polyatomic ions the coordination number of an atom is determined by simply counting the other atoms to which it is bonded (by either single or multiple bonds). For example, [Cr(NH3)2Cl2Br2]− has Cr3+ as its central cation, which has a coordination number of 6 and is described as hexacoordinate.
What is coordination number with example?
The coordination number is the number of ligands attached to the central metal atom or ion. For example, tetra carbonyl nickel Ni(CO)4 has a coordination number of 4 as 4 CO ligands are attached to Ni atom.
How do you find coordination number?
Here are the steps for identifying the coordination number of a coordination compound.
- Identify the central atom in the chemical formula. ...
- Locate the atom, molecule, or ion nearest the central metal atom.
- Add the number of atoms of the nearest atom/molecule/ions. ...
- Find the total number of nearest atoms.
Learn more about coordination number here: