The ionisation potential value of K is less than that of Na. Explain.
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Solution
The removal of an electron from the valence shell of a neutral gaseous atom requires energy which is termed as the ionization energy or ionization potential.
Due to the greater size of K as compared to Na, the electrostatic attraction due to the nucleus is reduced in K. So the energy required to remove an electron from the outermost shell of K is less than that of Na.