How many quantum number are required to identify an orbital? Explain it with the help of specific example.

Explanation

In order to identify an orbital, three quantum numbers need to be mentioned. These are principal quantum number (n), azimuthal quantum number (l) and magnetic quantum number (m). For example, in order to denote `2p_(x),2p_(y) and 2p_(z)`, the respective values of the said quantum numbers are-
(1) `2p_(x):n=2,l=1,m=-1`.
(2) `2p_(y):n=2,l=1,m=0`
(3) `2p_(z):n=2,l=1,m=+1`
Incidentally, it may be noted that the values of all the four quantum numbers need to be mentioned to specify a particular electron in any atom.