Question

the group of active metals that have one electron in an s orbital are known as the
a. transition metals

1. alkaline - earth metals

c. metalloids
d. alkali metals

Explanation:

Alkali metals are in Group 1 of the periodic table and have one electron in their out - most s orbital. Transition metals have partially filled d orbitals. Alkaline - earth metals have two electrons in their outermost s orbital. Metalloids have properties intermediate between metals and non - metals.

Answer:

D. alkali metals