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प्रश्न
Explain the postulates of Bohr’s atomic model.
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उत्तर
The main postulates of Neil’s Bohr are as follows:
- In atoms, electrons revolve around the nucleus in special orbits called discrete orbits or shells or energy levels.
- While the electrons revolve, they do not radiate energy.
- The circular orbits are numbered as 1, 2, 3, 4 or designated as K, L, M, N shells. These numbers are referred as principal quantum numbers (n).
- K shell (n = 1) is closer to the nucleus and is associated with lowest energy. L, M, N are the next higher energy levels. As the distance from the nucleus increases, the energy of the shells also increase.
- The energy of each orbit or shell is a fixed quantity.
- As the distance from the nucleus increases, the size of the orbits also increases.
- The maximum number of electrons that can be accommodated in an energy level is 2n2 (n = quantum number of its orbit).
- When an electron absorbs energy, it jumps from lower energy level to higher energy level.
- When an electron returns from higher energy level to lower energy level, it gives off energy.
Energy levels around the nucleus of an atom: Bohr's model.
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संबंधित प्रश्न
Describe Bohr’s model of the atom.
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State in brief the drawbacks of Rutherford's atomic model correlating them with the postulates of Bohr’s atomic model.
An atom with 3 protons and 4 neutrons will have a valency of
What are the Limitations of Bohr’s Model?
Given below are two statements:
Statement I: Atoms are electrically neutral as they contain equal number of positive and negative charges.
Statement II: Atoms of each element are stable and emit their characteristic spectrum.
In the light of the above statements, choose the most appropriate answer from the options given below:
A particle of mass ‘m’ and charge ‘−2q’ is moving around a very heavy particle having charge ‘q’. If Bohr’s model is to be used then the orbital velocity of mass ‘m’ when it is nearest to the heavy particle is (in magnitude) (ε0 = permittivity of free space, h = Planck’s constant) ______.
