Final answer:
A sheet of paper is approximately 500,000 atoms thick.
Step-by-step explanation:
To find out how many atoms thick a sheet of paper is, we need to convert the thickness of the paper and the size of an atom to the same unit of measurement. Let's convert the thickness of the paper from millimeters to nanometers. Since 1 millimeter is equal to 1,000,000 nanometers, the thickness of the paper is 0.1 mm x 1,000,000 nm/mm = 100,000 nm. Now we can divide the thickness of the paper by the diameter of an atom to find out how many atoms thick it is. 100,000 nm / 0.2 nm = 500,000 atoms thick.