➡Mention Features of Bohr's nuclear model (Highlight Bohr's Quantization condition)
➡Draw backs of the theory
Answers
Answer:
The Bohr model has the following features: 1) There is a nucleus (this was Rutherford's discovery). 2) The electrons move about the nucleus in "stationary states" which are stable, that is, NOT radiating energy.
Drawbacks of Bohr's Model:
It was primarily for hydrogen atom. It couldn't elaborate spectra of multi-electron atoms. Wave nature of electron was not justified by the model (inconsistent with the de Broglie's hypothesis of dual nature of matter) It didn't illustrated molecules making process of chemical reactions.
Hey there_!
Features of Bohr's Nuclear model_
▶ Electron Can revolve only in certain stable orbits called Energy levels (or) Stationary states(since energy of these orbits remains constant)
▶ Electron has same energy as that of the orbit in which it is revolving
▶While revolving in particular energy electron don't emit any radiation(Maxwell's theory)
▶Defining Stable orbits
Electron revolves only on those orbits for which orbital angular momentum of electron of integral multiple of h/2π, where h is Planck's constant
L = nh/2π
m v r= nh/2π-------Bohr's Quantization condition
▶If an electron either gains (or) looses energy, then it must move to different orbits
▶Electron can gain energy(or)loose energy , if it gains energy, then it moves to higher energy(excitation of e-) level. If it looses energy, then it de excites to lower energy level(de excitation of e-)
Drawbacks of Bohr's Model_
➡ This theory was only applicable for single electron species like H, He+ , Li++, Be+++.
➡It failed to explain spectrum from of multi electron species
➡Bohr considered e- as a particle, while De-Broglie hypothesis emphasise e- as wave.
▶It failed to explain the splitting up of spectral lines in the presence of
1. Electric Field(Stark effect)
2.Magnetic Field(Zeeman effect).