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Question

Given the PES from the previous question, explain why the ionization energy for the valence electrons of Ne is higher than that of Ar.
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A
Ne has more protons than Ar which requires more energy to remove the valence electron.
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B
Ne has more nuclear shielding than Ar which requires less energy to remove the valence electron.
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C
Ar had more protons than Ne which requires more energy to remove the valence electron.
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D
Ar had more nuclear shielding than Ne which requires less energy to remove the valence electron.
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Solution

The correct option is A Ne has more protons than Ar which requires more energy to remove the valence electron.
Neon has high effective nuclear charge than Argon . So it requires more energy to remove valence electrons. So ionisation energy of 'Ne' is greater than that of 'Ar'.

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