7.2 Ionization Energy

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    Ionization Energy

    Energy required to remove an electron

    ionization energy

    Irregularities in the Trend

    Atoms with exactly full or half-full subshells have higher ionization energies.

    irregularities in the trend

    Successive Ionization Energies (2nd, 3rd, 4th, etc.)

    Core electrons have SIGNIFICANTLY higher ionization energies than valence electrons.

    Ionization Energies of Boron
    B(g) ➔ B+(g) + e- I.E.1 = 801 kJ/mol
    B+(g) ➔ B2+(g) + e- I.E.2 = 2,427 kJ/mol
    B2+(g) ➔ B3+(g) + e- I.E.3 = 3,660 kJ/mol
    B3+(g) ➔ B4+(g) + e- I.E.4 = 25,026 kJ/mol