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Bohr's Model of Atom

Electrons rev...

Question

Electrons revolve around the ___________ in different energy levels or shells and each shell is associated with definite energy.

A

nucleus

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B

orbits

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C

orbitals

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D

none of the above

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Solution

The correct option is D nucleus
Electrons revolve around the nucleus in different energy levels or shells and each shell is associated with definite energy.
Note: Electrons revolve around the nucleus in concentric circular orbits at fixed distance from nucleus. These are stationary orbits and the energy of electrons in these orbits is constant. As long as electrons revolve in these stationary orbits, they do not radiate energy.

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Q. (a) As long as an electron revolves in a particular orbit, the electron does not lose its energy. Therefore, these orbits are called stationary orbits and the electrons are said to be in stationary energy states.
(b) Each orbit or shell is associated with a definite amount of energy. Hence these are also called energy levels.
(c) An electron jumps from a lower energy level to a higher energy level, by absorbing energy. It jumps from a higher energy level to a lower energy level, by emitting energy in the form of electromagnetic radiation.
(d) Electrons move around the nucleus in specified circular paths called orbits or shells or energy levels and are designated as K, L, M, N shells respectively.

Arrange the above postulates of Bohr's theory in a correct sequence:

H

-atom or one electron system energy levels of orbitals of a shell are degenerates whereas in many electron system energy levels of orbitals of a shell are non degenerates because of :

Q. The structure given below is of an atom showing shells or orbits, each of these shells is associated with a fixed amount of energy. Which among the K, L , M shells has the highest energy?

Q. Electrons revolve around the nucleus in circular orbits called shells.

Q. Which electronic shell is at a higher energy level

K

L

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