Question

calculate the eneagy associated with the first orbit
of He: What is the radius of this arbit?​

Answer 1

Answer:

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Explanation:

ENERGY =13.6*(z^2/n^2) electron volt                  

where z stands for atomic number and n stands for orbit number

now in the case of helium in this case,z=2,n=1

therefore energy=13.6*(4/1)

                           =13.6*4=54.4ev

radius=52.6(n^2/z)picometer

           =52.6*(1/2)

             =26.3picometer