Answer :

The transition metals have larger masses than one‘s alkali and alkaline earth metal counterparts.

This, coupled with the fact that transition elements have a smaller atomic volume than alkaline and alkali earth metals, tries to explain the higher density.  Transition metals are thicker and more strong than alkali metals. Alkali metals have much fewer boiling and melting points than transition metals. When alkali metals interact with water, they shape an alkaline solution; transition elements just don't. By having lost one or two electrons, a transition metal does not accomplish the stable electron configuration of the closest noble gas. As a result, transition metals are less reactive and do not readily lose electrons as alkali or alkaline earth metals do.

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