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Question

Describe Bohr’s model of the atom.

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Solution

According to Bohr’s theory:
a) The atom consists of a small positively charged nucleus at its centre.
b) The whole mass of the atom is concentrated in the nucleus and the volume of the nucleus is smaller than the volume of the atom by a ratio of about 1:10.
c) The nucleus contains all the protons and neutrons of the atom.
d) The electrons of the atom revolve around the nucleus in definite circular paths known as orbits which are designated as K, L, M, N or numbered as n=1,2,3,4 outward from the nucleus.
e) Each orbit is associated with a fixed amount of energy. Therefore, these orbits are also known as energy levels or energy shells.




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