In the case of multiple orbitals with the same energy, unoccupied orbitals will be filled before any occupied orbitals are reused. This principle emphasizes the priority of filling unoccupied states when available.
If multiple orbitals of the same energy are avail.pdf
1. If multiple orbitals of the same energy are available unoccupied orbitals will be
filled before occupied orbitals are reused
Solution
If multiple orbitals of the same energy are available unoccupied orbitals will be
filled before occupied orbitals are reused