In nature nothing happens without a reason. Every substance is made up of atoms and molecules. There was a time when it was assumed that atom is the smallest part of a substance and it cannot be broken. With the progress of science we have come to know that each atom has three subatomic particles named electron, proton and neutron. The electron is negatively charged and the protons are positively charged. When an atom loses the negatively charged electrons it becomes positively charged and when new electrons enter an atom it becomes negatively charged.
