Who was responsible for reviving the idea of atoms by proposing what has been called the "Billiard Ball Model"?

Thomson
Rutherford
Democritus
Dalton

oxygen, selenium, tellurium, and polonium.

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

that's what i got you can count the number of atoms

each chemical family is represented as a group or column on the periodic table. based on chemical properties, there are 6 types of chemical families. group 1 represents alkali metals, group 2 represents alkaline earth metals, groups 3 to 12 represent transition metals, groups 13 to 16 represent non-metals and other metals, group 17 represents halogens and group 18 represents noble gases.