write down main postulates of niels bohr for Atomic model on the basis of the model Drawn The diagrams of atomic structure of Sodium and potassium element
Answers
The Bohr's postulates -
1) An electron can revolve around the nucleus in certain fixed orbits of definite energy without emission of any radiant energy. Such orbits are called stationary orbits.
2) An electron can make a transition from a stationary state of higher energy E2 to a state of lower energy E1 and in doing so, it emits a single photon of frequency,
ν=E2−E1h where h is the Planck's constant.
Conversely, on absorbing an energy, E2−E1when the electron is at energy E1, the electron can make a transition from E1 to E2.
3) Only those orbits are allowed for which the angular momentum of the electron is an integral multiple of h2π,
Thus, L=nh2π where n=0,1,2,.....
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(this is your answer mate)In 1913 Neils Bohr put forward the following postulates about the model of an atom:
Electrons revolve around the nucleus only in certain permissible circular orbits. This orbit is called shell. The first shell from the nucleus is 'K' shell The subsequent shells are L, M, N, 0,..respectively.
Electrons in each shell have been associated with definite amount of energy. Electrons in higher shell have more energy than those nearer to the nucleus.
The energy of an electron remains constant as long as it revolves in its own shell. The shells are also called energy levels or stationary energy levels.
According to Bohr's model, electrons occupy certain stable orbits or shells. Each shell has definite energy.
These orbits or shells are represented by the letters K, L, M, N, …. or the numbers 1, 2, 3, 4, …
The maximum number of electrons present in the shell is given by the formula (2n2), where n is the orbit number or shell number.
The maximum numbers of electrons in different shells are as follows:
The first orbit or K shell will have 2 × 12 = 2 electrons.
The second shell will have 2 × 22 = 8 electrons.
The third shell will have 2 × 32 = 18 electrons.
The fourth shell will have 2 × 42 = 32 electrons and so on.