Electric Charges
No one knows exactly what electric charge is, but there are two different types of electric charge.
Protons have positive electric charge, and electrons have negative electric charge.
The amount of positive charge on a proton is exactly equal to the amount of negative charge on an electron.
An atom contains equal numbers of protons and electrons, so the positive and negative charges cancel out and an atom has no net electric charge.
Objects such as shoes and carpets are made of atoms and usually have no net electric charge.
Objects with no net charge are said to be neutral.
