The three major rules for the class are?

sodium (na), for example, has one electron in its valence shell. this is an unstable state because that valence shell needs eight electrons to be full. in order to fill its valence shell, find a way to add seven electrons to its valence shell

14,16 18 reacts with group

its first and third is your answer i did the qustion the fourth isnt right

oxygen, selenium, tellurium, and polonium.

they're all from the same group as sulfur (group 16).