Derive the expression of 1st Bohr orbit applying Bohr’s 'theory.

Stare Bohr's theory.

Write three defects of Bohr theory?

Write two limitations of Bohr’s theory.

Using Bohr's postulates of the atomic model, derive the expression for radius of n-th electron orbit. Hence obtain the expression for Bohr's radius.

Derive the equation for radius of n th shell form Bohr theory.

Using Bohr's porstulates of atomic model, derive the expression for the radius of the n^(th) orbit.

To energise an electron from 1st Bohr orbit to the 3rd Bohr orbit for Li^(2+) ion, what is the required energy?

According to Bohr's theory mention the expressions of the following parameters for hydrogen atom: (i) radius of Bohr orbit, (ii) velocity of electron , (iii) orbital frequency of electron, (iv) angular momentum of electron, (v) kinetic energy of electron (iv) potential energy of electron.

State Paulils exclusion principle. Give an example of an ion which obeys Bohr’s theory.

It the energy of 1st Bohr orbit be 13.6eV of a hydrogen atom, then calculate the energy for 2nd orbit in Joule.