1 ene 1913 año - Bohr Model of the Atom

Descripción:

Through an observation of the patterns of wavelengths in the Hydrogen spectrum, Bohr was able to explain its formation and hence propose a new model of the atom, putting forward 3 postulates:
1. Electrons revolve in fixed energy levels without radiating energy, (Bohr used Planck's ideas on quantisation of energy) and hence explained why electrons did not spiral into the nucleus, a factor that the Rutherford model of the atom could not explain.
2. Angular momentum is quantised and can only take values of mvr
3. When an electron receives a quantum of energy equal to the difference between the current and higher energy level, the electron absorbs the energy and transitions to the higher level. When returning back to ground state, the absorbed energy is emitted, of which the energy is broken up into frequencies by a prism to form an emission spectrum. The energy emitted is given by E=hf

Limitations:
- applies to one electron atom only
- Could not explain: difference in line intensity in emission spectrum, the cause of very fine and close spectral lines and the splitting of spectral lines when a sample was placed in a magnetic field.

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