Question

give reason for during ion formation an electric charge develops on elements

Answer 1

During ion formation, an electric charge develops on the elements.
reason
              because  they are stable when the are in a compound after the for mantion of ion there will be no stability

Answer 2

During ion formation, an atom gains or loses electrons. If the atom gains ... Thus, an electric charge develops on theelements. This unequal number of negative and positive charges can occur in one of two ways: An atom can gain a proton (a positive charge) or lose an electron (a negative charge).

Usually, the number of protons and electrons in atoms are equal. But there are cases in which an atom can acquire an electrical charge.