Question

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

Answer 1

a/c to Bohr theory
radius of any orbit=(0.529).n^2/z A
where n is no of orbit and z is atomic number.
radius of 4th orbit of He+ =(0.529) x (4)^2/2=(0.529) x8=4.232A