write the postulates of bohr model
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In an atom, electrons (negatively charged) revolve around the positively charged nucleus in a definite circular path called as orbits or shells. Each orbit or shell has a fixed energy and these circular orbits are known as orbital shells.
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Explanation:
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 radiations and when an electron jumps from lower orbit to a higher orbit it absorbs energy in the form of radiations.
- 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
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