Spectrum of $L i^{2 +}$ is similar to that of :

H

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B e

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H e

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N e

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Solution

The correct option is A $H$
Electronic configuration of $L i$ is $1 s^{2} 2 s^{1}$ and of $L i^{2 +}$ is $1 s^{1}$ .
That is similar to the electronic configuration of $H (1 s^{1})$ which has only one electron in its valance shell, thus it has spectrum similar to that of $H$ .

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Similar questions

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

H e^{+}

H e

Correct order of radius of the $1^{s t}$ orbit of $H$ , $H e^{+}, L i^{2 +}, B e^{3 +}$ is:

H, H e^{+}, L i^{2 +}, B e^{3 +}

H < H e^{+} < L i^{2 +} < B e^{3 +}

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