The graph below shows the first ionization energies for the elements of the second period. While the general trend is that ionization energy increases when going from left to right of the period, neither B nor O follow this trend. Explain why the first ionization energies for B and O are less than Be and N, respectively. 1st lonisation Energy for Perlod 2 2200 Ne 2000 1800 1600 1400 0. 1200 1000 Be 800 600 Li 400 200 3 45 6 7 8 9 10 Atomic number 1st IE in kJ/mol

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