## Chemistry: A Molecular Approach (3rd Edition)

Be 1s$^{2}$2s$^{2}$ The first and second ionization energies involve removing 2s electrons, while the third ionization energy removes a core electron. Given this, the jump must occur between the second and third ionization energies.
Be 1s$^{2}$2s$^{2}$ The first and second ionization energies involve removing 2s electrons, while the third ionization energy removes a core electron. Given this, the jump must occur between the second and third ionization energies.