Which law represents the pairing of electrons in a subshell after each orbital is filled with one electron?

A. Pauli's exclusion principle B. Hund's rule C. Heisenberg's principle D. Hess's law

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The correct answer is B.

Hund's Rule states that electrons will fill each orbital within a subshell singly before any orbital is doubly occupied. This means that electrons will pair up in an orbital only when all the orbitals in that subshell have one electron each.

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