Electron n. : Amber; also, the alloy of gold and silver, called electrum.

Example:
What must happen for an Electron to move to a higher energy level?

Taxonomy
electron, particles, atoms, energy, positron, photons, mass, magnetic moment, magnetic field, electron beam, proton, interaction, the wave, vacuum, quantum mechanics, experiments, wave, momentum.

Defination from the web:
electron is a subatomic particle that carries a negative electric charge. ... When an electron collides with a positron, they annihilate, producing a pair (or more) of gamma ray photons. ... An electron generates a magnetic field while moving, and it is deflected by external magnetic fields. ...