Question

which of the following is true regarding the transition elements?
A. Multiple oxidation states resulting from the involvement of d electrons in bonding is a characteristic of transition elements.
B. Most transition elements have lower melting and boiling points than the main group elements.
C. Transition elements have predictable reactivity patterns.
D. Changes in atomic radii in transition elements are greater than those in the main group elements

Answer 1

A is a true statement.
B is not true.
C I think is true because chemists with experience can predict most of them; however, I believe the spirit of the question is to call it not true. Since there are multiple oxidation states a plethora of compounds are possible.
D is far from true.

Answer 2

its a