⚛ Chadwick's Neutron Discovery — 1932

α particles bombard beryllium → neutron released → proton ejected from paraffin wax

α particle (He²♠)
Neutron (n°)
Proton (p♠)
⁹Be  +  α → ¹²C  +  n°
α Fired
0
Neutrons
0
Protons Ejected
0