Which of the following atoms has the low

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Target Exam

CUET

Subject

Physics

Chapter

Nuclei

Question:

Which of the following atoms has the lowest ionization energy?

Options:

$Be^{+++}$

$Li^{++}$

$He^+$

${_1^1H}$

Correct Answer:

${_1^1H}$

Explanation:

Ionization energi is $\propto z^2$

Since hydrogen has lowest atomic number hence its ionisation energy is minimum.

The correct answer is Option (4) → ${_1^1H}$