What is unique about the way that transition metals form compounds? a. They don't form compounds
C. They can form bonds with the electrons in the
two outer-most shells
b. They are the most reactive
d. They can donate all of their electrons

A. They don't form compounds

Explanation:

High density: The strong bonding between the atoms in transition metals cause them to be tightly held together, creating a high density. Colored compounds: Transition metals tend to form more colored compounds than other elements, either in solid form or dissolved in a solvent.