How are N 2 , CN − , and CS alike? Mark all that are true. All three chemical species have the same overall formal charge. the same number of valence electrons. a bond order of 3. a double bond. a σ p as the highest occupied molecular orbital (HOMO). a σ ∗ p HOMO. a π p as the lowest unoccupied molecular orbital (LUMO). a π ∗ p LUMO. completely filled degenerate π p orbitals (2 e − in each orbital). singly filled degenerate π p orbitals (1 e − in each orbital). singly filled degenerate π ∗ p orbitals (1 e − in each orbital). empty degenerate π ∗ p orbitals (no e − in orbitals).