If atoms are made up of smaller parts such as electrons why are atoms considered as the basic unit of matter

What was the procedure by which case united states vs lopez went to court

Asolution contains 225 g of sodium chloride, nacl, dissolved in enough water to make a 0.25 l of solution. what is the molarity of the solution? a. 3.88 m, b. 1.03 m, c. 1.5 m, d. 15.5 m

  the mississippians were considered to be  horticulturalists, which means they were