The transition elements form a large number of complex compounds . This is due to the comparatively smaller sizes of the metal ions , THEIR HIGH IONIC CHARGES and the availibility of d orbitals .
Please explain the term high ionic charges in detail . I hope you understand the meaning of detail.

Dear Student 

The higher ionic charge means the variable oxidation state of a transition elements. This variable oxidation state or the higher ionic charge is shown due to very less energy difference between (n-1)d and ns orbital which causes the stable variable oxidation state.

Regards

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