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Answer :
Selenium has a higher ionization energy than calcium due to its electronic structure and its position in the periodic table. Ionization energy is inversely proportional to the size of the atom, which means that the smaller the atom, the larger its ionization energy.
Ionization energy is the minimum amount of energy required to remove an electron from the outermost shell of an atom.
Selenium is smaller than calcium and therefore has a higher ionization energy. Also, selenium has an electron configuration of 2-8-18-6, which means that its valence electron is in a deeper shell than the valence electron of calcium, which has an electron configuration of 2-8-8. -2.
This makes it more difficult for selenium to lose its valence electron and therefore has a higher ionization energy compared to calcium.
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