Which of the following atoms has the lowest ionization potential?

1. ${ }_7^{14} \mathrm{~N}$
2. ${ }_{55}^{133} \mathrm{Cs}$
3. ${ }_{18}^{40} \mathrm{Ar}$
4. ${ }_8^{16} \mathrm{~O}$

Solution

Asked in: JEE Main 2003

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