The spectrum of helium is expected to be similar to that of:

H

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L i^{+}

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N a

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H e^{+}

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Solution

The correct option is B $L i^{+}$
No. of electrons in $L i^{+}$ & $H e = 2$ . Therefore the spectrum will be same for both of them with same no. of electrons.

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Similar questions

The spectrum of $H e^{+}$ is expected to be similar to that of:

H e^{+}

H e

L i^{2 +}

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