Suppose a cube of aluminum which is 1.00 cm on a side accumulates a net charge of +3.00 pC.
What is the percentage of the electrons originally in the cube was removed?

Here is a list of fun facts I collected:
Atomic weight of Aluminum
26.98 g/ mol

Atoms per mole
6.022×10^23


Density
2.70g⋅cm3


Electric charge
−1.60×10^−19C

Mass of an electron
9.11×10^−31kg