Define the Magnetic Quantum Number which is Expressed by m - QS Study
QS Study

Magnetic Quantum Number (m):

This quantum number describes the behavior of electron in magnetic fields. We know that the movement of electrical charge is always associated with magnetic fields. Since the revolving electron possess angular momentum, it will give rise to a very small magnetic field which will interact with external magnetic field of the earth. Under the influence of external magnetic field, the electrons in given sub shell orient themselves in certain preferred regions of space around the nucleus These are called to orbitals thus; this quantum gives the number of orbital in a given sub shell. It is designed by m. The allowed values of m depends upon the value of l. For a given values of l, m can have, values – l through 0 to + l, that is m = – l,…. 0, ….. + l

In other words, there are (2 l + 1) values of m for each value of l. For example, if l = 0, m has only one value, i.e. m = 0

i.e. s sub-shell has only one orbital called s—orbital

If l =1,m may be, – 1, 0, + 1

These are designated by alphabetic subscripts ( Px, Py and Pz)