Question

elements in group 2 are all called alkaline earth metals. what is most similar about the alkaline earth metals?
how many protons and neutrons they have
which chemical properties they have
how many total electrons they have
which period they are most often found in

Explanation:

Elements in the same group have similar chemical properties because they have the same number of valence electrons. Alkaline - earth metals in group 2 have 2 valence electrons, which gives them similar chemical reactivity patterns.

Answer:

which chemical properties they have