Name the principle , which says an orbital can hold only 2 electrons and explain .

Explanation

1) Name of the principle : Pauli's exclusion principle.
2) No, two electrons in an orbital can have all four quantum numbers same .
3) It says there is a chance to hold only 2 electrons , one rotates in clockwise direction `(+ (1)/(2))` , other rotates in anticlock wise direction `(- (1)/(2))`