The first ionization energy is smallest for the atom with electronic configurations
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The alkali metals have a very high tendency to lose electron as their uni positive cation has the inert gas configuration.
The First Ionization Energy
The energy needed to remove one or more electrons from a neutral atom to form a positively charged ion is a physical property that influences the chemical behavior of the atom. By definition, the first ionization energy of an element is the energy needed to remove the outermost, or highest energy, electron from a neutral atom in the gas phase.
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