In the Bohr's theory of H atom

According to bohr's theory of H atom, for the electron in the n^(th) allowed orbit

According to bohr's theory of H atom, an electron can revolve around a proton indefinitely, if its path is

(i) What is the orbital angular momentum of a p-electron in (h)/(2pi) unit? (ii) (a) Atomic number of two elements X and Y are 15 and 27 respectively. Write down the electronic configuration of X^(3-) and Y^(3+) ions- (b) State two limitations of Bohr's theory of H-atom.

Describe the essential postulates of Bohr's theory of atom. How does Bohr's theory differ from that of Rutherford ?

Give any two postulates of Bohr's theory of atomic model.