No two can be alike...........each ONE is unique...........1 and a 2........like 1/2.................



No TWO electrons can be in the same state..............two...................1/2.......like 2/1..........like 12??  But I am making this up.............


Pauli Exclusion Principle - HyperPhysics Concepts

hyperphysics.phy-astr.gsu.edu/hbase/pauli.html

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Pauli Exclusion Principle. No two electrons in an atom can have identical quantum numbers. This is an example of a general principle which applies not only to electrons but also to other particles of half-integer spin (fermions). It does not apply to particles of integer spin (bosons).