The Na + ion and the Ne atom are isoelectronic. The ease of loss of an electron

Question:

The Na⁺ ion and the Ne atom are isoelectronic. The ease of loss of an electron by a gaseous Ne atom, first ionization energy, has a value of 2081 kJ/mol. The ease of loss of an electron from a gaseous Na⁺ ion, second ionization energy, has a value of 4562 kJ/mol. Why are these values not the same?

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