![]() In an oxygen atom, there are four electrons in the \(2p\) sublevel, so one orbital contains a pair of electrons. In a nitrogen atom, there are three electrons in the \(2p\) sublevel and each is unpaired. The elements of Group 13 (\(\ce\), etc.). ![]() ![]() There are several exceptions to the general increase in ionization energy across a period. In general, the ionization energy of an atom will increase as we move from left to right across the periodic table.
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