The ionisation potential value of $K$ is less than that of $N a$ . 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 $N a$ , 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 $N a$ .

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