Hello, me answer these three questions quickly ! who ever has the correct answer get brainliest and a you.

First one is a compound.  Second one is single atom and single element. third one is a molecule.

the answer is either b or c

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.