CUET Preparation Today
Which of the following atoms has the lowest ionization energy? |
$Be^{+++}$ $Li^{++}$ $He^+$ ${_1^1H}$ |
${_1^1H}$ |
The correct answer is Option (4) → ${_1^1H}$ This is a neutral hydrogen atom with $Z=1$. Its single electron experiencies the least nuclear attraction compared to the ions. Therefore, hydrogen has lowest ionization energy among the given options. |
