If an orbital in the 2p subshell is completely filled before each orbital in the 2p subshell is partially filled, it is a violation of Hund's rule.
Every atomic orbital within a sublevel is singly occupied before it is doubly occupied, and all singly occupied orbitals have electrons with the same spin, according to Hund's Rule of Maximum Multiplicity, also known as Hund's Rule. Before pairing up with another electron in the same orbital, electrons will always occupy their own suborbital. When drawing molecular orbital diagrams and electron configurations, this rule is helpful. When applying Hund's Rule, pairing electrons twice before it is necessary is the most frequent error made. Electrons should not be paired when filling out p orbitals until each suborbital has one electron.
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