Practice question
Question
What is the coordination number of nickel in [Ni(en)2(H₂O)2]2+?
Explanation
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.
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