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Quantum Number

The energy le...

Question

The energy levels of the orbits are represented by a quantum number, known as .............

A

n

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B

l

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C

m

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D

k

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Solution

The correct option is A $n$
The principal quantum number, n, describes the energy of an electron and the most probable distance of the electron from the nucleus. In other words, it is referring to the size of the orbital and the energy level an electron is placed in.
In the case of orbital quantum number, it gives the shape of the orbital and the energy of an orbital is decided by both principal quantum number(n) and orbital quantum number(n).

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Similar questions

Q. If Azimuthal quantum number

^{'} l^{'}

^{'} k^{'}

of elliptical orbit are related as

l = k

, what would be the maximum number of electrons in

K, L, M

N

Q. The principal quantum number (n) and azimuthal quantum number (l) for the circular path present in the fourth main energy level are:

Q. Select the correct statement(s) among the following:
(i) Total number of orbitals in a shell with principal quantum number '

n

n^{2}

.
(ii) Total number of subshell in the

n

th energy level is

n

.
(iii) The maximum number of electrons in a subshell is given by the expression

(4 l + 2)

m = l + 2

l

m

are azimuthal and magnetic quantum numbers.

Q. Assertion :Each principal level of quantum number

^{'} n^{'}

contains a total of

^{'} n^{'}

sub levels. Reason: Each orbital can hold two electrons and each sub level of quantum number

^{'} l^{'}

contains a total of

(2 l + 1)

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:

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