When orbitals are equal in energy,one electron is added to each orbital until the orbitals are half-filled,before any orbital is completely filled.

Name: When orbitals are equal in energy,one electron is added to each orbital until the orbitals are half-filled,before any orbital is completely filled.
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This is known as Hund's rule, which states that electrons will fill degenerate orbitals singly (and with parallel spins) before pairing up in any one orbital.

When Orbitals Are Equal in Energy,one Electron Is Added to Each