Question

What are the Postulates of Bohr's Model of an Atom?​

Answer 1

Explanation:

The Bohr model postulates that electrons orbit the nucleus at fixed energy levels. Orbits further from the nucleus exist at higher energy levels. When electrons return to a lower energy level, they emit energy in the form of light.

Answer 2

Solution :-

The Postulates of Bohr's Model of an Atom are as Follows :-

(i) In an Atom, The Electrons revolve around the Nucleus in Certain Definite Circular Paths called Orbits or Shells. These are Represented by the Letters K, L, M, N.... or the Numbers n = 1, 2, 3, 4 . . .

(ii) The Maximum Number of Electrons present in a Shell is given by the Formula $\bold {2n^2}$, where n is the Orbit Number or Energy Level Index, 1, 2, 3 . . . Hence, the Maximum Number of Electrons in different Shells are as follows :

First Orbit (K Shell) will be = $2 \times 1^2 = \bold 2$,

Second Orbit (L Shell) will be =  $2 \times 2^2 = \bold 8$

Third Orbit (M Shell) will be = $2 \times 3^3 = \bold {18}$ and so on...

(iii) The Maximum Number of Electrons that can be accommodated in the Outermost Orbit is 8.

(iv) Electrons are not Accommodated in a Given Shell unless the Inner Shells are filled. That is the Shells are Filled in a Step-wise Manner.

(v) While revolving in Discrete Orbits the Electrons so not Radiate Energy.

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