Question

Define coordination number with example.

Hint:

Coordination number helps to determine the geometry and stability of a coordination complex.

Answer 1

Step 1: Coordination Number Definition.
The coordination number of a metal atom or ion in a coordination compound is the number of ligands directly bonded to it. It indicates the number of coordination bonds formed between the metal ion and the surrounding ligands.

Step 2: Example.
In the complex \( [Co(NH_3)_6]^{3+} \), the coordination number of the central metal ion \( Co^{3+} \) is 6 because it is surrounded by six ammonia molecules \((NH_3)\), which are the ligands.

Step 3: Conclusion.
Thus, the coordination number is an important feature in coordination compounds and is determined by the number of ligands attached to the central metal atom.