Question

states the potulates of bors model of atome​

Answer 1

Postulates of Bohr's atomic model :

According to Bohr's theory , electrons revolve in definite circular orbits around the nucleus and these orbits are designated by the letters K, L, M, N or by the numbers 1, 2 ,3, 4 and so on.
As long as the electrons revolve in a particular orbit they can neither gain energy nor loose energy. Such orbits are called as stationary orbits or stationary states.
When an electron jumps from an higher orbit to a lower orbit it releases energy in the form of raldiations and when an electron jumps from lower orbit to a higher orbit it absorbs energy in the form of raldiations.
The angular momentum of aln electron is an integral multiple of h/ 2π mvr = nh/ 2π
It explains the stability of an atom and also the line spectrum of hydrogen atom

Answer 2

1. The electrons revolving around the nucleus are confined to certain fixed orbits called shells or energy levels ,each of which is associated with a fixed amount of energy.

2. While it is revolving around the nucleus in an orbit, an electron neither loses not gains energy.

3. An electron revolving in a particular orbit, in gaining a certain amount of energy, jumps to the next orbit and vice versa. Since each orbit is associated with a fixed amount of energy, Bohr called it an energy level.