Dr. Sereda, I am still a bit confused on the counting of electrons on aromatic and antiaromic species. When a triangle, square, or hexagon has a + sign somewhere on the molecule, does that not contribute to counting of electrons? (It does contribute, because electrons carry a negative charge. - GS). Furthermore, does a - symbol count as two electrons? (No. It means that the structure has one more electron, than its neutral analogue. For instance, cyclopentadienyl-cation with 4 electrons has one less electron, than its neutral analogue - free radical with 5 electrons. Cyclopentadienyl-anion with 6 electrons has one more electron, than its neutral analogue - free radical with 5 electrons. - GS).