According to Pauli's exclusion principle, no two electrons in an atom can have identical quantum numbers.
This general principle applies to both the electrons and other particles of half-integer spin, referred to as fermions.
Which of the following is not allowed by the exclusion principle? (a) knowing both the precise position and precise momentum of an electron (b) having two electrons in the same quantum state (c) having an electron with a spin that is neither up nor down
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