Which of the following is true about ionization energy?

University of Ilorin CHM101 2023 past question

1. 1st ionization energy is less than 2nd ionization energy
2. 2nd ionization energy is greater because it's easier to remove a second electron
3. Group 3 elements always have higher ionization energy than Group 2
4. All ionization energies are equal for a given element

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