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Imagine removing one electron from He^(4...

Imagine removing one electron from `He^(4)` and `He^(3)`. Their energy levels, as worked out on the basis of Bohr model will be very close. Explain why ?

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On removing one electron, the energy levels of `He^4` and `He^3` will be very close because both the nuclei are very heavy as compared to the mass of an electron. Hence, energy of remaining atom is not affected much on removal of electron.
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