Question

What is the co-ordination number of $Ni$ in $\left[Ni\right(N{H}_3{)}_4{]}^{2+}$?

Answer 1

Coordination number of $Ni$ in $\left[Ni\right(N{H}_3{)}_4{]}^{2+}$

Coordination number is the number of ligands surrounded by the central ion. Coordination number of $Ni$ is $4$.