Pauli's exclusion principle states that no two electrons in an atom can have the same four quantum numbers.
The Pauli exclusion principle states that no two electrons in an atom or molecule can have the same four-electron quantum number. If an orbital can contain a maximum of two electrons, so the two electrons must have opposite spins. That is, if one electron is assigned as a spin-up (+1/2) electron, the other electron must be a spin-down (-1/2) electron.
Electrons in the same orbit have the same first three quantum numbers. principle quantum number n=1 , azimuthal quantum number l=0 , magnetic quantum number, [tex]m_{l}[/tex] =0 in 1s subshell. Only two electrons can have these numbers, so their spin moment must be either [tex]m_{s}[/tex] = −1/2 or [tex]m_{s}[/tex] = +1/2. If the 1s orbital contains only one electron, it has a [tex]m_{s}[/tex] value and the electron configuration is written as 1s¹ (corresponding to hydrogen).
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