Question

Why do transition metal form a large number of complexes?

Answer 1

their electronic configuration are of such type that they make a large no. of complonds..
they easily loose and accept the electrons....

Answer 2

Hey !!

Transition metal form a large number of complex compound because it is due to small size and high ionic change / availability of d orbitals.

DETAILED EXPLANATIONS

This is due to the comparatively smaller sizes of the metal ion, their high ionic charges and the availability of d - orbitals for bond formation.

Good luck !!