Question

please give this answer

Answer 1

barium will form ions readily bcoz it has the largest because it has a larger atomic size compared to the others. hence the electrons in the outermost shell will be farthest from the nucleus and will have weak nuclear attraction on them. so they will easily be able to get detached from their shell n hence Ba can easily form ions

all of these metals have 2 Valence Electrons and hence their valency is 2. they all are metals.