Question

Transition metal form a large number of complex copound

Answer 1

1) small size of the metal ion
2) high charge density
3) availability of empty d-orbitals

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 !!