The Pauli exclusion principle states that :

  1. A

    no two electrons in an atom can have the same four quantum numbers 

  2. B

    electrons can have either ±12spins

  3. C

    electrons with opposing spins are attracted towards each other 

  4. D

    none of the above 

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    Solution:

    According to Pauli's exclusion principle, no two electrons in an atom may have identical quantum numbers. It implies that two electrons must have the opposite spin if they are in the same orbital. Additionally, it suggests that a maximum of two electrons can fit into one orbital.
    Pauli's exclusion principle states that two electrons cannot have the same set of quantum numbers.

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