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Definition : 		 A set of numerical value that explain the position of electron in an atom.

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neon visuals GIF by xponentialdesign - Find &amp; Share on GIPHY | Gif, Atom,  Neon atom

Quantum numbers are of four types. Principle quantum number Azimutual  quantum number Magnetic quantum number Spin quantum number

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It can be represented by  l It tell us Number of orbital in an orbit Angular momentum of orbit    √l(l + 1) (ℏ) The value of l = n-1 For 1 st  shell  we have only value l =0 For 2 nd  shell we have two values    l= 0 , 1 For 3 rd  shell we have three values    l = 0 , 1 , 2 For 4 th  shell we have four values       l = 0 , 1 , 2 , 3

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It can be represented by m. It tell us Orientation of atomic orbital in space. Degeneracy of orbital Magnetic quantum have total number of ( 2 l  + 1 )

Subshell  Azimutual  (l) Magnetic ( m l  )            s                 0                  0            p                        1             -1,0,  +1            d                 2        -2,-1,0,  +1,+2            f                 3 -3,-2,-1,0,+1,+2,+3

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Pauli exclusion principle: 		 No two electron present in the same orbital have same value of quantum number, spin quantum number always varies

Quantum number

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