Question

What are the postulates of Bohr’s model of hydrogen atom? Discuss the importance of this
model to explain various series of line spectra in hydrogen atom?

Answer 1

Answer:

Postulates of Bohr's theory : <br> (1) Electrons revolve around the uncleus in certain , definite circular paths , called orbits . They are also known as energy levels or shells . <br> (2) Each orbit is associated with a definite amount of energy . Hence these orbits are called energy orbits or energy levels or energy shells . <br> (3) As the value of n increases , the size and energy of the orbit increases . <br> (4) As long as the electrons revolve in the circular orbits , they neither emit nor absorb energy . Hence , these orbits are also called stationary orbits . <br> (5) More than one stationary orbit is possible for any electron and the angular momentum of the revolving electron is quantized . That is , the electrons revolve in those circular orbits in which the angular momentum of the revolving electron is an integral multiple of

h/2πr

. <br> This can be expressed as

mvr = n ×h/2π

....