Page 2 - LN 6

 The number of spectral lines obtained when an electron jumps from
higher level n to ground state = n(n-1)/2
 The number of spectral lines obtained when an electron jumps from
higher level n to lower level n =(n -n )(n -n +1) /2
1
2
1
2
2
1

 LIMITATIONS OF BOHR'S ATOMIC MODEL :

 Inability to explain line spectra of multi-electron atoms.
 Inability to explain splitting of lines in the magnetic
field(Zeeman effect) and in the electric field(Stark effect).
 Inability to explain the three dimensional model of atom.
 Inability to explain the shape of molecules.
 Inability to explain de Broglie concept of dual nature of matter

and Heisenberg's uncertainty principle.