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Standard IX
Chemistry
Bohr's Model of an Atom
Question

In Bohr's model of an atom :

  1. Each shell in associated with a definite amount of energy.
  2. These circular orbits or shells are stationary.
  3. Electrons revolve around the nucleus in circular orbits.
  4. All shells have equal energy level.

A
These circular orbits or shells are stationary.
B
Electrons revolve around the nucleus in circular orbits.
C
All shells have equal energy level.
D
Each shell in associated with a definite amount of energy.
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Solution
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According to Bohr's model of an atom,
(i) Electrons revolve around the nucleus in circular orbits.
(ii) These circular orbits are also called as stationary orbits or shells because as long as an electron is in this particular orbit, it neither gains nor loses energy.
(iii) Every stationary shell is associated with a definite amount of energy.
(iv) The energy of orbits increases as we move away from the nucleus.

Hence, options (A), (B) and (C) are correct.

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Similar Questions
Q1
(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:

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Q2
Electrons revolve around the ___________ in different energy levels or shells and each shell is associated with definite energy.
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Q3
Electrons revolve around the nucleus in circular orbits called shells.
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Q4
According to Bohr's postulate, electrons revolve around the nucleus in certain definite circular paths called stationary orbits in which they do not radiate energy.
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Q5
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?

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