Ionization energy is the minimum energy required to remove an electron from a gaseous atom or ion. The first ionization energy (IE₁) removes the first electron, the second ionization energy (IE₂) removes the second electron from the resulting ion, and so on. Successive ionization energies always increase (IE₁ IE₂, removing an electron from Mg²⁺ requires the most energy. Mg²⁺ has already lost two electrons and achieved a stable noble gas configuration ([Ne]). Removing a third electron would involve breaking into this stable core electron shell, which requires a very high amount of energy compared to removing valence electrons from Mg or Mg⁺.
Which has maximum Ionization Energy ?
Asked in MPSC CS Prelims 2021 · Topic: Atomic Structure (Electronic Configurations of Multi-electron Atoms and Ions)
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