Question

1. choose the best answer. which of these element groups is the least reactive? alkali alkaline earth transition

Explanation:

Alkali metals (Group 1) are highly reactive as they have one valence electron and easily lose it. Alkaline - earth metals (Group 2) have two valence electrons and are also reactive. Transition metals have partially filled d - orbitals. In general, transition metals are less reactive compared to alkali and alkaline - earth metals because they have a more stable electron configuration due to the ability to use d - orbitals in bonding in a more complex way, and they do not have the very low ionization energies (like alkali metals) or the strong tendency to lose electrons (as in the case of alkali and some alkaline - earth metals).

Answer:

transition