Rutherford’s nuclear model simply stated that atom had a nucleus and the negative charge electrons were present outside the nucleus. It did not say anything as to how where these electrons were arranged. It also could not explain why electro did not fall into the nucleus. Niles Bohr (1913) proposed his atomic model from the concept of nucleus as proposed by Rutherford but applied the Quantum Theory of Radiation, as developed by Planck and Einstein to explain the behavior of the planetary electrons, and was built on the basics of the following postulates:
1. The electrons in an atom revolve round the nucleus in definite number of selected circular orbits. Each orbit is associated with a definite amount of energy and the energy of an electron remains constant so long as it stays in the orbit. Such selected orbits are called stationary stages or energy level or orbits.
2. The absorption or emissions of energy take place always in whole number.
3. Orbits are numbered as 1, 2, 3, etc are called K, L, M, etc respectively.
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