Question

Using Bohr atomic model, drive expression for calculating the radius of orbits (5)
in He+
. Using this expression, calculate the radius of fourth orbit of He+
ion.

Answer 1

formula
r=n2a°
data
n=5
a=0.529A°
solution
r=n2a°
r=(5)2(0.529)
r=13.225.

Answer 2

as we know
r=n^2*a/Z
where n= orbit no. =5
a =0.53A
Z=atomic no.
...
r=n^2 *a/Z
=5^2*0.53A/2
=25*0.53A/2
=6.625 A