Ordinary matter is made up of atoms which have positively charged nuclei and negatively charged electrons surrounding them. The magnitude of the charge on one proton or electron is called the elemenary charge "e". Charge is quantized as a multiple of the electron or proton charge:
proton charge: e=1.602 x 10-19 Coulombs
electron charge: e=-1.602 x 10-19 Coulombs
One coulomb (C) of charge represents an excess or deficit of 6.24 x 1018 electrons.
The quantity of charge (Q) on an object is equal to the number of elementary chages on the object (N) multiplied by the elementary charge (e).
Q = Ne
How much charge does the capacitor hold if it has 4.5 billion elemenatary charges?