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NEET 1988 (AIPMT) · Energy of the Electron & Energy Levels

Energy of the Electron & Energy Levels question from NEET 1988 (AIPMT)

Q63NEET 1988 · AIPMTEasy

Energy of the Electron & Energy Levels

The ionisation energy of hydrogen atom is 13.6 eV, the ionisation energy of a singly ionised helium atom would be

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Answer: (d)

Ionisation energy from ground state $= 13.6\,Z^2$ eV.
He $^+$ has $Z = 2$ : $13.6 \times 4 = 54.4$ eV
So the answer is (d) $54.4$ eV.

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