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For which of the following species, the ...

For which of the following species, the expression for the energy of electron in nth orbit, `E_(n)=(13.6Z^(2))/(n^(2))eV*"atom"^(-1)` has the validity-

A

`He^(2+)`

B

`Li^(2+)`

C

deuterium

D

tritium

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The correct Answer is:
B, C, D
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