What do elements in the first two columns of the periodic table have in common? a. they have two valence electrons.
b. they tend to lose electrons to gain stability.
c. they react strongly with the alkali metals.
d. hey do not react with halogens.

1which body contains the majority of the mass in the solar system earth jupiter the moon the sun 2 what keeps the objects in the solar system such as planets orbiting around the sun the force of gravity the galaxy exerts on all objects within it including the solar system the great distance between the sun and the planets the sun's nuclear fusion which acts on each object the gravitational force between the sun and each object in the solar system