Postulates of bohr model of atom
Answers
1. An atom consists of a small, havy positively charge nucleus in the centre nd electron revolve around it in circular orbit.
2. Each orbit has fixed value of energy, these orbit are known as energy level nd designated by K, L, M, N.
3. There are several orbits, electron revolve only in those orbit whoes angular momentum is integral multiple of h/2 pie.
It mass of electron is m nd it is revolving with speed u, in an orbit with radius r then
Angular momentum, mur = nh /2 pie
n is principle quantum no nd h is planck constant.
I hope it helps you
atomic physics, the Rutherford–Bohr model or Bohr model or Bohr diagram, presented by Niels Bohr and Ernest Rutherford in 1913, is a system consisting of a small, dense nucleus surrounded by revolving electrons —similar to the structure of the Solar System, but with attraction provided by electrostatic forces rather than gravity. After the cubic model (1902), the plum-pudding model (1904), the Saturnian model (1904), and the Rutherford model (1911) came the Rutherford–Bohr model or just Bohr model for short (1913). The improvement to the Rutherford model is mostly a quantum physical interpretation of it. The model's key success lay in explaining the Rydberg formula for the spectral emission lines of atomic hydrogen. While the Rydberg formula had been known experimentally, it did not gain a theoretical underpinning until the Bohr model was introduced. Not only did the Bohr model explain the reason for the structure of the Rydberg formula, it also provided a justification for its empirical results in terms of fundamental physical constants.
The Bohr model is a relatively primitive model of the hydrogen atom, compared to the valence shell atom. As a theory, it can be derived as a first-order approximation of the hydrogen atom using the broader and much more accurate quantum mechanics and thus may be considered to be an obsolete scientific theory. However, because of its simplicity, and its correct results for sele