Explain Pauli exclusion principle by example .

Explanation

The number of electron to be filled in various orbitals is restricited by the exclusion principle given by the austrian scientist wolfgang Pauli (1926)
Rule : No two electrons in atom can have the same set of four quantum numbers.
Second method : Only two electron may exist have opposite spin.
Used : pauli exclusion principle on the number capacity of electron to be present in any subshell.
Subshell in comprises of one orbital and thus the maximum number of electron present in 1s subshell can be two
Sub shell 4 had five orbitals so it can accomodate 10 electrons

if principle quantum number n
thus number of orbitals in n= `n^(2)`
Maximum number of electron in n= `2n ^(2)`
Example : The electron configuration of He is `1s^(2) ` for this two electron the value of `n,1,m` is 1,0,0, its spin quantum number `+(1)/(2) ` and `(1)/(2) ` are differ from each other with opposite spin