| स्तंभ $I$ (धातुएं) | स्तंभ $II$ (उपसहसंयोजन यौगिक) |
| $a. Co$ | $i. \text{विल्किंसन उत्प्रेरक}$ |
| $b. Zn$ | $ii. \text{क्लोरोफिल}$ |
| $c. Rh$ | $iii. \text{विटामिन } B_{12}$ |
| $d. Mg$ | $iv. \text{कार्बोनिक एनहाइड्रेज}$ |
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