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Calculate the radius of 2^(nd) excited ...

Calculate the radius of `2^(nd)` excited state of `Li^(+2)`

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`2^(nd)` excited state, means `e^(-)` is present in `3^(rd)` shell so.
`r_(3)" "= 0.529xx(3xx3)/(3)=0.529xx3Å = 1.587 Å`
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