Which of the following atoms has the lowest ionization potential ?

Physics · JEE Main · NTA Exams — Atoms and Nuclei

1. \({ }_{7}^{14} \mathrm{~N}\)
2. \({ }_{55}^{133} \mathrm{Cs}\)
3. \({ }_{18}^{40} \mathrm{Ar}\)
4. \({ }_{8}^{16} \mathrm{O}\)

Answer

(B) _ 55 ^ 133 Cs

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