# Pauli exclusion principle

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The **Pauli Exclusion Principle** states that no two electrons in the same atom can have the same set of quantum numbers. This set is made up of

- Principal quantum number
*n*: this is the shell around the atom where the electron exists. The shells are represented by whole numbers. n can be 1,2,3.... - Orbital quantum number
*l*is the number of subshells within a shell. l can be 0,1... to (n-1) - Magnetic quantum number
*m*is the number of orbitals within the subshell. m_{l}_{l}can be 0,1...all the way to^{+}/_{-}l - Spin quantum number
*m*is the spin of the electron. there are two spins per subshell. they are represented by a +1/2 or -1/2_{s}

The Pauli exclusion principle follows from the requirement that fermions must have antisymmetric wavefunctions.