Screening effect is not observed in :-

H e^{+}

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L i^{2 +}

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B e^{3 +}

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In all cases

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Solution

The correct option is D In all cases
The screening effect takes place for the elements which have at least two electrons. Here all have only 1 electron thus does not have any other electron to screen the electrons from the nucleus.

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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 +}

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

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