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Why transition elements form complex...

Why transition elements form complexes ? (OR) why do d-block elements form complexes ?

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Transition elements have strong tendency to form complexes because of two reasons . They are
(i) Small size and high positive charge density.
(ii) Presence of vacent (n-1) d orbitals which are of appropriate energy to accept lone pair and unshared pair of electrons from the ligands for bonding with them.
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SURA PUBLICATION-TRANSITION AND INNER TRANSITION ELEMENTS-Very Short Answer
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