The first ionization enthalpy for Li is 520 kJ mol^-1. This value corresponds to complete removal of the electron from the nucleus and is achieved when n = infinity. From this value, calculate the effective charge felt by the 2s electron of Li. Why is this less than the actual charge of +3?

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.