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Which electron configuration represents the atom with the highest second ionization energy (I2)? 1s2 2s2 2p6 3s2 3p1 1s2 2s2 2p6 3s2 3p6 1s2 2s2 2p6 3s1 1s2 2s2 2p6 3s2 3p4 1s2 2s2 2p6 3s2