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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 `n^(th)` orbit `[E_(n) = -(13.6)/(n^(2)) xx Z^(2) e "V atom"^(-1)]` has the validity ?

A

Tritium

B

`Li^(2+)`

C

Deuterium

D

`He^(2+)`

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The correct Answer is:
A, B, C
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