Question

which group has 1 valence electron?
a. alkaline earth metals
b. transition metals
c. alkali metals
d. lanthanides

Explanation:

Alkaline earth metals have 2 valence electrons. Transition metals have variable valence - electron numbers. Lanthanides also have complex valence - electron configurations. Alkali metals, which are in Group 1 of the periodic table, have 1 valence electron.

Answer:

C. Alkali metals