#H2O ligand

What is the coordination number of nickel in [Ni(en)2(H₂O)2]2+?

Each ethane-1,2-diamine (en) is bidentate (2 donor atoms), and each H₂O is unidentate. In [Ni(en)2(H₂O)2]2+, 2 en (4 atoms) + 2 H₂O = 6.

Ref: NCERT Class 12 Chemistry > Chapter 5: Coordination Compounds > Topic: Werner's Theory and Definitions - Ligands Coordination Number