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  4. The spectrum of helium is expected to be similar to that of

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Q. The spectrum of helium is expected to be similar to that of

AIPMTAIPMT 1988Structure of Atom

Solution:

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.