If the Nucleus of an Atom Has a Radius of About

Multiple Choice

If the nucleus of an atom has a radius of about 5 fm and a mass of about 2 *10^-21 g, what is its approximate density? (The volume of a sphere = 4 $\pi$ r³/3.)

A) 4 *10¹⁵ g/cm³
B) 4 *10¹² g/cm³
C) 4 *10⁹ g/cm³
D) 4 * 10⁶ g/cm³
E) 4 * 10³ g/cm³