The electric charge is a physical quantity that determines the intensity of electrostatic interactions.
The net charge a body possesses is equal to the number of excess of elementary charges (positive or negative) times the elementary charge, i.e., \begin{equation} Q = ne \end{equation} where \(n\) is the number of electrons transferred or received, and \(e\) is the value of the elementary charge.
Every atom is electrically neutral if its number of protons is equal to the number of electrons.