You might need the Periodic Table for this--> In the alkaline-earth group, atoms with the smallest radii:?

Question

a.) are the most reactive
b.) have the largest volume
c.) are all the gases
d.) have the highest ionization

Answer 1

I would go with d, assuming that answers means "have the highest ionization potential." See the following two links for full explanations.

Essentially, the ionization potential of an atom decreases down and to the right of the periodic table.

Answer 2

Either a or d. I am not sure which, but the others do not make sense.