Hund's rule states that the most stable arrangement of electrons : (for a ground state electron configuration)

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has three electrons per orbital, each with Identical spin

has $m_{1}$ values greater than or equal to +l

has the maximum number of unpaired electrons, all with the same spin in degenerate orbital

has two electrons per orbital, each with opposing spin

answer is C.

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Detailed Solution

According to Hund's rule, all orbitals in a sublevel must be solely occupied before any orbital can be double occupied. The same spin is shared by every electron in singly occupied orbitals (to maximize total spin).
According to Hund's rule, the electron configuration with the greatest number of unpaired electrons that all have the same spin in a degenerate orbital is the most stable.

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