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Calculate the energy associated with the...

Calculate the energy associated with the first orbitof `He^(+)`.What is the radius of this orbit ?
Hint `: E_(n) = - 2.18 xx10^(-18) ((Z^(2))/( n^(2))) J //`atom
`He^(+) ( Z=2)`
`r_(n) = ( 52.9(n^(2)))/(Z) ` pm

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