
Blue toruses = 19 protons
Red  toruses = 11 nuclear electrons
Atomic number of O19 = protons (19) - nuclear electrons (11) = (8)
Oxygen 19 decays by electron emission (from a side position) of
Oxygen 19
 producing Fluorine 19
 nucleus (stable)
The electron can liberated only from a side position, not as depicted in pictures, which has made for the purpose of symmetry.
Click on image for larger F19 nucleus.
Photon model of light
Nuclear symmetry
Nuclear structure

| O12 | O13 | O14 | O15 | O16 | O17 | O18 | O19 | 
| H | He | Li | Be | B | C | N | O | F | Ne | Na | Mg | Si | S | Ar | Ca | 
| Fe | Ni | Zn | Ga | Ge | Se | Kr | Rb | Sr | Y | Nb | Mo | Ru | Rh | Pd | Ag | 
| In | Sb | I | Ba | Ce | Nd | Sm | Tb | Yb | Ta | W | Os | Ir | Au | Hg | Pb | 
 
Oxygen 19 nucleus and decomposition to Fluorine 19 by one of the terminal electron emission.