Question

If the ionization potential of helium atom is $24.6\text{V}$, the energy required to ionize it, will be,

• A. $24.6\text{eV}$
• B. $12.3\text{eV}$
• C. $13.6\text{eV}$
• D. $6.8\text{eV}$

Answer 1

The correct option is A $24.6\text{eV}$

Ionization energy, $E=eV$
$=1.6\times {10}^{-19}\times 24.6\text{J}$
$=24.6\text{eV}$

So, the energy required to ionise helium atom, will be, $24.6\text{eV}$

Hence, $\left(A\right)$ is the correct answer.

Why this question? This question is based on Ionization energy concept.