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Why d-block element form complexes?

1. due to larger size and higher nuclear charge
2. due to small size and low nuclear charge
3. due to small size and higher nuclear charge
4. none of the above

Correct answer: due to small size and higher nuclear charge

Solution

d-block ions often have relatively small ionic radii and high effective nuclear charge, giving them high charge density. This makes them strong Lewis acids, so they readily accept lone pairs from ligands and form complexes.

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