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Question
Imagine removing one electron from He4 and He3. Their energy levels, as worked out on the basis of Bohr model will be very close. Explain why.
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Solution
Bohr model is applicable for hydrogen atom-and some lighter atoms in which a single electron revolves around a stationary nucleus of positive charge Ze (called hydrogen-like atom). If we remove one electron from He4 and He3, atoms contain one electron and become hydrogen-like atoms. Now we can apply the Bohr model to define the energy levels.
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