What do all group 2 elements have in common? (2 points) they all gain two electrons to form a stable outer energy level. they form convalent bonds with halogens. they all react easily with the noble gases. they tend to form ionic bonds by losing electrons

Four statements about the development of the atomic model are shown below. a: electrons have wavelike properties. b: atoms have small, negatively charged particles. c. the center of an atom is a small, dense nucleus. d: atoms are hard, indivisible spheres. which order of statements represents the historical development of the atomic model? c-d-a-b c-d-b-a d— в-а — с d-b-c-a