Blue toruses = 9 protons
Red toruses = 5 nuclear electrons
Atomic number of Be (4) = protons (9) - nuclear electrons (5)
If you like to say, Be9 contains only one neutron (= the central proton-electron pair). The other 4 neutons are not true because the 4 nuclear electrons are common with two neighbour protons each in turn.
Click on image for Boron 9 nucleus structure (half life = 8x10-19 s).
| Be6 | Be7 | Be8 | Be9 | Be10 | Be11 | Be12 | Be13 | Be14 | Be15 | Be16 |
| H | He | Li | Be | B | C | N | O | F | Ne |
| Na | Mg | Si | S | Ar | Ca | Fe | Ni | Nd | Pb |
Structure of isotope Beryllium 9 atomic nucleus. Be9 nuclei with 9 proton and 5 nuclear electron inside nucleus of element Boron 9 isotope.