In chemistry, the shielding effect sometimes referred to as atomic shielding or electron shielding describes the attraction between an electron and the nucleus in any atom with more than one electron. The shielding effect can be defined as a reduction in the effective nuclear charge on the electron cloud, dueto a difference in the attraction forces on the electrons in the atom. It is a special case of electric-field screening.This effect also has some significance in many projects in material sciences.