It is possible for three of the four quantum numbers to be the same for a pair of electrons.

Name: It is possible for three of the four quantum numbers to be the same for a pair of electrons.
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According to the Pauli exclusion principle, no two electrons in an atom can have the same set of all four quantum numbers. However, they can share the same three quantum numbers (n, l, m_l) but must differ in the fourth quantum number (m_s), which represents the electron's spin.

It Is Possible for Three of the Four Quantum Numbers