Which of the following atoms has the lowest ionisation potential?

Which of the following atoms has the lowest ionisation potential?

Options

(a) ₈O¹⁶
(b) ₇N¹⁴
(c) ₅₅Cs¹³³
(d) ₁₈Ar⁴⁰

Correct Answer:

₅₅Cs¹³³

Explanation:

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