electron, n.Trivia

The nucleus is heavy --- if it were as heavy as a bowling ball, the electrons would be as light as a penny

Electrons have 1840 times less mass than that of a proton and neutron

The 1906 Nobel in Physics went to J.J. Thomson who showed electrons were particles. His son G. P. Thomson won the Nobel Prize in Physics in 1937 for showing that electrons are waves.

One second is technically the duration of 9,192,631,770 oscillations of a Caesium 133 atom's outermost electron.