Quantum Numbers and Types
An atom contains large number of shells and subshells. These are distinguished from one another on the basis of their size, shape and orientation (direction) in space. The parameters are expressed in terms of different numbers called quantum numbers.
Quantum numbers may be defined as a set of four numbers with the help of which we can get complete information about all the electrons in an atom. It tells us the address of the electron i.e., location, energy, the type of orbital occupied and orientation of that orbital.
1. Principal quantum number (n)
2. Azimuthal or angular momentum quantum number (l):
3. The magnetic quantum number (m):
4. The spin quantum number (s):