In what way are the observed oxidation states of the lanthanides related to their electronic configurations?

Describe the general characteristics of the transition elements with special reference to their tendency to:
(i)    Exhibit paramagnetism.
(ii)    Form complex compounds.
(iii)    Their catalytic behaviour.

Why are transition metals able to form alloys?

How is the variability in the oxidation states of transition metals different from that of the nontransition metals? Illustrate with examples.

Assign reasons for the following:
The enthalpies of atomisation of transition metals are high.