Quantum Numbers and types
are useful to locate the address of electron in the atom. There are four types of quantum numbers, they are
1) Principal quantum numbers
2) Azimuthal quantum numbers
3) Magnetic quantum numbers
4) Spin quantum numbers
Principal quantum numbers
These are proposed by
and are represented by ‘
’. This number represents the number of principal orbits to which the electron belongs. Principal quantum numbers have integral values like n=1,2,3,4 or K, L, M , N. these signifies the size of an atom by measuring radius. By knowing these quantum numbers many things like energy of electron, number of sub shells in an orbit, number of orbital’s in an orbit and number of electrons in a orbit can be calculated
Azimuthal quantum number
introduced azimuthal quantum numbers and are basically denoted by
. The value of
and can be calculated by subtracting 1 form the value of
can have all the integral values starting from zero to n-1.
When l=0 then the corresponding electron belongs to
When l=1 p-sub shell
When l=2 d-sub shell
When l=3 f-sub shell
So for the above we can conclude that one can predict the position of electron by knowing the value of azimuthal quantum number. Azimuthal quantum number helps in finding out the shape of orbital. This quantum number is also called as angular momentum quantum number of subsidiary quantum number. This quantum number helps in calculating number of electrons in an electron (4l+2), number of orbitals in a sub shell (2l+1)
Magnetic Quantum number
This set of quantum numbers is proposed by
and are denoted by
. The range of
. This quantum number signified the spatial orientations of an electron in orbital. If an electron is in
sub shell then
, so there is one orientation in magnetic field of all the electrons corresponding to
sub shell. Similarly there are three orientations for a
sub shell they are Px, Py, Pz and for
sub shell there are five degenerate orbitals and seven for
sub shell. This quantum numbers are proposed for the explanation of Zeeman and Stark effect.
Spin Quantum Numbers
Uhlenbeck and Goudsmith
are the persons who proposed these quantum numbers. These quantum numbers are denoted by
. electron spins around its axis in addition to revolving round the nucleus. In general a electron has two types of spins.
Clock wise and Anti-clock wise spins
. The possible values of spin quantum numbers are + ½ and – ½ and these values are denoted by arrows which indicate upward or downward directions.
Did you like this resource? Share it with your friends and show your love!
Responses to "
Quantum Numbers and types
No responses found. Be the first to respond...
Notify me by email when others post comments to this article.
Do not include your name, "with regards" etc in the comment. Write detailed comment, relevant to the topic.
No HTML formatting and links to other web sites are allowed.
This is a strictly moderated site. Absolutely no spam allowed.
to fill automatically.
(Will not be published, but
to validate comment)
Type the numbers and letters shown on the left.
Subscribe to Email
Get Jobs by Email
Forum posts by Email
Articles by Email
Awards & Gifts
Kishori Mohon ...
Last 7 Days
K. Singh ...
K. Singh Mohindra
DIGVIJAYSINH SAHDEVSINH RANA
Bhuvaneswara Rao Nalla
ISC Technologies, Kochi - India. Copyright © All Rights Reserved.