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Calculate the energy associated with the...

Calculate the energy associated with the first orbit of `He^(+)` . What is the radius of this orbit?

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`E_(n)=-((2.18xx10^(-18)J)Z^(2))/(n^(2))"atom"^(-1)`
For `He^(+),n=1,Z=2`
`E_(1)=((2.18xx10^(-18)J)(2^(2)))/(I^(2))=-8.72xx10^(-18)J`
The radius of the orbit is given by
`r_(n)=(52.9)/(Z)` pm.
`r_(n)=((0.0529nm)n^(2))/(Z)`
Since n=1, and z=2
`r_(n)=((0.0529nm)I^(2))/(Z)=0.02645nm`
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