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Standard XII
Chemistry
Planck's Quantum Hypothesis
why are orbit...
Question
why are orbits also known as shells or energy levels?
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Solution
Each shell or orbit corresponds to a definite energy. Therefore, these circular orbits are also known as energy levels or energy shells.
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Q.
Why orbits are also called energy levels?
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:
Q.
In
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 energy levels of the orbits are represented by a quantum number, known as .............
Q.
While revolving in discrete orbits, the electrons do not radiate energy. These orbits or shells are called ________.
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