Niels Bohr made certain modification in Rutherford.s model by adding the ideas of quantum hypothesis.
State Bohr.s second postulate of quantisation of angular momentum.

Bohr combined classical and early quantum concept and gave his theory in the form of three postulates. State three postulates of Bohr Model of atom?

Louis de Broglie argued that electron in circular orbit as proposed by Bohr, must be seen as a Particle wave. From Bohr.s postulate of angular quantization mo mentum, arrive at an expression for wave length of an orbital electron.

According to de-Broglie.s explanation of Bohr.s second postulate of quantization, the standing particle wave on a circular orbit for n=4 is given by

The hydrogen-like species Ļi^(2+) is in a spherically symmetric state S_(1) with one radial node. Upon absorbing light the ion undergoes transition to a state S_(2) The state S_(2) has one radial node and its energy is equal to the ground state energy of the hydrogen atom. The orbital angular momentum quantum number of the state S_(2) is:

The general features of the structure of a hydrogen atom and hydrogen like species were quantitatively explained by Niels Bohr: Write any postulate of the Bohr’s model of the hydrogen atom.