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What are Quantum Numbers? Quantum Numbers are the numbers required to completely specify the position of  electrons . In the presence of strong  magnetic field  (when spin orbit interaction is not considered), the four quantum numbers are: 1) Principal quantum number (n) 2) Orbital angular momentum quantum number (l) 3) Magnetic quantum number (me) 4) Magnetic spin angular momentum quantum number (Ms) However, when spin orbit interaction is considered, the four quantum numbers are : 1) Principal quantum number (n) 2) Orbital angular momentum quantum number (l) 3) Total angular momentum quantum number (J) quantum numbers  In Detail- quantum numbers a) Principal quantum number (n)- It can have values 1, 2, 3 ..(n-1).It is associated with size of orbits radius energy levels. b) Orbital angular momentum quantum number (l)- It can have values 1, 2, 3 ..∞.It is associated with energy levels, shapes etc. c) Magnetic orbital quantum number (m e )- This ...