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Bohr Atomic model, Niels Bohr made some modifications to Rutherford’s model. The modified atomic model of, Niels Bohr is also known as the shell model of an atom., , The postulates of Bohr’s model of an atom are as follows:, 1. Only certain special orbits,known as discrete orbits of electrons, are allowed inside the, atom., 2. While revolving in the discrete orbits, the electrons do not radiate energy., 3. An electron can jump from one orbit to another by absorbing or emitting a fixed amount of, energy in the form of radiation., Bohr named these orbits as energy levels. These orbits (or shells) are represented by the, letters K, L, M, N…, or the numbers n = 1, 2, 3, 4…., , Distribution of Electrons or Electronic Configuration, The Distribution of electron in different orbits in an atom is called electronic configuration., Bohr, along with, Charles R. Bury, suggested certain rules to show this electronic distribution., For example - the element has 12 electrons. So, the K-shell fills first with 2 electrons. The, remaining 10 electrons are divided among the L-shell and the M-shell as follows: 8 in the, L-shell and 2 in the M-shell. Thus, the element has a total of 3 energy shell.