Which among the following is correct about reactivity of Calcium and Barium?
Calcium is more reactive than Barium
Barium is more reactive than Calcium
Both are equally reactive
Nothing can not be predicted
Barium is more reactive than Calcium. Due to larger size of Barium, the valence electrons in Barium are further away from the positive nucleus and so are loosely held in place. This means that Barium is able to release these two electrons more easily than Calcium. Hence, more reactive is Barium.