According to the periodic trends, Nitrogen (N) has the largest ionization energy among the given atoms: N, P, As, and Sb.
Ionization energy generally increases from left to right across a period on the periodic table.
Since Nitrogen is to the left of Phosphorus, Arsenic, and Antimony, it will have the highest ionization energy.
Additionally, within a group, ionization energy decreases down the column.
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