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JEE Main 2018 (15 Apr, Shift 1) · Energy of the Electron & Energy Levels

Energy of the Electron & Energy Levels question from JEE Main 2018 (15 Apr, Shift 1)

Q43JEE Main 2018 · 15 APR · SHIFT 1Medium

Energy of the Electron & Energy Levels

The energy required to remove the electron from a singly ionized Helium atom is $2.2$ times the energies required to remove an electron from Helium atom. The total energy required to ionize the Helium atom completely is:

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Answer: (c)

Removing the electron from He $^+$ ( $Z = 2$ , $n = 1$ ): $13.6 \times 4 = 54.4$ eV.
First ionisation of He $= \frac{54.4}{2.2} \approx 24.7$ eV.
Total $= 54.4 + 24.7 \approx 79$ eV
So the answer is (c) $79$ eV.

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