As compared to potassium,sodium has

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(B) The ionization energy $(IE)$ of an element depends on its atomic size. As we move down the group in the periodic table,the atomic size increases,w

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Higher ionization potential

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(B) The ionization energy $(IE)$ of an element depends on its atomic size. As we move down the group in the periodic table,the atomic size increases,which leads to a decrease in the ionization energy.Sodium $(Na)$ is in the $3^{rd}$ period,while potassium $(K)$ is in the $4^{th}$ period. Therefore,sodium has a smaller atomic radius than potassium.Because of its smaller size,the valence electron in sodium is more strongly attracted by the nucleus compared to potassium,resulting in a higher first ionization potential $(IE_1)$.$IE_1$ $(kJ/mol)$$Na: 496$$K: 419$

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