Chemical change
1. Change in number of orbital electrons takes place.
2. Requires energy of few eV for a chemical reaction to take place.
3. Number of atoms of each kind is conserved in reactants and products
Nuclear change
1. Change in number of nucleons takes place.
2. Nuclear change require much higher energy of the order of 106 times as compared to chemical change.
3. Atomic number and mass number is conserved.
