C. Need the same number of electrons to fill their valence shells
D. Have the same number of valence electrons
Step-by-step explanation:
Yes I know I answered a year late, the reason why I answered this is because so other people that have this question would know both of the correct choices. If you want to you could give this brainlest, you don't have to if you don't want. To be honest I don't really care if you do or not.
