The diameter of an atom is about 10-10 m.
(a) How many atoms make a line a millionth of a meter (10-6 m) long?
(b) How many atoms cover a square a millionth of a meter on a side?
(c) How many atoms fill a cube a millionth of a meter on a side?
(d) If a dollar were attached to each atom, what could you buy with your line of atoms? With your square of atoms? With your cube of atoms?