Crossword Clue:

ELECTRON an elementary particle

AnswerCrossword Clue
MUONSubatomic particle more massive than an electron
BETARAYElectron particle emission
MESONElementary particle
ATOMElementary particle
IONElementary particle
MUONElementary particle
NEUTRINOElementary particle
GLUONBinding elementary particle
TAU... lepton (elementary particle)