Before understanding the concept of the current conduction of electricity, it is necessary to understand why conduction is possible. Conduction is possible due to the presence of ions in an atom or solution. Ions are the elements or groups of elements that bear some of the charges on them. This charge may be positive or negative.
Why solid NaCl does not conduct electricity but in molten form is conducted electricity?
In solid-state, there is a very close and very strong bonding between an anion and a cation. due to opposite charges and complete transferring there is no free electron to conduct the electricity. but in molten form or in an aqueous medium there is a weak bond due to the dielectric property of water. dielectric property of water converts a strong bond into a weak bond so ions formation takes place so electricity is conducted in the aqueous media.