The spectrum of He is expected to be similar to that of:
Correct answer: D. Li+
- A. Hydrogen
- B. Sodium
- C. Oxygen
- D. Li+
Explanation
The spectrum of an atom depends on the number of electrons present in it. Here, helium has two electrons, so the spectrum of 'Li+(Z=3)' is similar to that of helium because both He and 'Li+' have two electrons.
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