In this page, there is the following paragraph:
"A metallic element contains $0.6022 \times 10^{24}$ atoms per mole (Avogadro's number) and $\rho_m/A$ moles per $cm^3$, where $\rho_m$ is the mass density (in grams per cubic centimeter} and $A$ is the atomic mass of the element. Since each atom contributes $Z$ electrons, the number of electrons per cubic centimeter. $n = N / V$, is "
Isn't $\rho_m/A$ simply the number of atoms per $cm^3$, since $A$ is mass per atom? Shouldn't you need to convert to moles (divide $\rho_m/A$ by $N_A$) to get moles per $cm^3$? Do we simply use the numerical value of $A$ an not convert to $g$?