Two solid samples each contain sulfur, oxygen, and sodium, only. these samples have the same color, melting point, density, and reaction with
an aqueous barium chloride solution. it can be concluded that the two samples are the same
(1) compound (3) mixture
(2) element (4) solution

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.