Protons

Canal rays (rays containing positively charged particles) :

• depend upon the nature of the gas present in the CRT. These are the positively charged ions (so, will have as many protons as the gas in the tube)
• charge to mass ratio depends on gas
• some particles carry a multiple of the fundamental unit of electrical charge.
• opposite behaviour to cathode rays in electrical or magnetic field (charge different)

Proton from hydrogen was characterised in 1919.