The coordination numbers of Co and Al in and respectively are: (en = ethane-1,2-diamine)

Question

The coordination numbers of Co and Al in  and  respectively are: (en = ethane-1,2-diamine)

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Strategy:
 The coordination number (CN) is the total number of coordinate bonds formed between the central metal atom and the ligands. Bidentate ligands form two bonds each.

Step 1: Calculate CN for Co in 
- 1  (monodentate) = 1 bond
- 2  (bidentate) =  bonds
Total CN = .

Step 2: Calculate CN for Al in 
- 3  (oxalate, bidentate) =  bonds.
Total CN = 6.

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