How many atoms of hydrogen are in 5. 29 × 1021 molecules of ethanol, ch3ch2oh?.

i believe it is-

d.) gravity pulled particles of dust and gas together to form planets.

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.