Paper thickness varies. Typically, $100$ sheets are about a cm thick. Atoms typically vary from $1$ to $3$

angstroms in radius. $($An angstrom is ${10}^{-10}m.)$ Suppose a piece of paper is $0\mathrm{.}0084cm$ thick. How

many atoms span the thickness if the radius of the atom is $3\mathrm{.}08$ angstroms?

In a problem like this a lot of irrelevant $($ to problem solving$)$ information is given. It helps to write out

what useful information is given and what you are going to solve for.

Answer: