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Transition metals form complexes far more readily than the s- and p-block (representative) elements mainly because:

1. vacant d-orbitals of suitable energy are available for accepting electron pairs
2. transition elements do not exhibit variable oxidation states
3. all the d-electrons are completely paired
4. f-orbitals are available for bond formation

Correct answer: vacant d-orbitals of suitable energy are available for accepting electron pairs

Solution

Transition metals have small size, high charge density and energetically accessible vacant d-orbitals, enabling them to accept electron pairs from ligands and form coordinate bonds.

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