We have a pretty darn good mathematical model and theory that describes the behavior electrons in elemental atoms and other subatomic particles in nature. (religion.blogs.cnn.com)
Such particles come about due to the properties of the materials but can not exist outside the crystal the way other subatomic particles do. (sciencedaily.com)
Neutrinos, like other subatomic particles, sometimes behave like waves. (discovermagazine.com)