This video explains Pauli’s Exclusion Principle:
In 1925, Pauli put some restrictions on assigning quantum number to electron in the orbital.
Statement: “No two electrons in an atom can have same set of four quantum numbers”.
This means that two electrons in an atom can have same n, l & m but differ in spin quantum number.
Examples: Hydrogen Atom - Atomic number - 2. It has 2 electrons.
Quantum numbers for 1st electron: n = 1, l = 0, m = 0 & s = +1/2
Quantum numbers for 2nd electron: n = 1, l = 0, m = 0 & s= -1/2
These two e- have same n, l, m but differ in 's' values.

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