Charge is basically the instantaneous situation of the atom , which arouse due to the presences or absence of the electrons.
Every thing is made up of atoms , and they have electrons , in the nucleus it has protons and neutrons . The charge on 1 electron is
In stable state when there is no charge on atom there are equal number of electrons and protons , when some electrons leave the atom it leaves behind equal amount of positive charge and when electrons enter the atoms it generates equal amount of positive charge .
lets take example,