If (*e-) exists (most likely in Potassium, Argon, or Oxygen atoms) attempting to
detect it other than by it's capture by Hydrogen or Deuterium poses a
challenge.
Attempting to eject it by electron stripping of an atom will probably
cause it to go into a lower energy level or shell releasing detectable
anomalous spectra.
The Auger Effect might shake it out of an atom where
it can be detected by using a mass spectrometer of sorts to
compare it's mass with that of an electron.
Electronium might be ubiquitous but not very ostentatious.
Fred
