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3)he discovered the ray in a lab when a green flash was produced  from a radiation.

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3)he found the ratio of the mass of an electron to its electric charge

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3)studied the positive alpha particles interacted with a solid matter

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3) he found the charge of the electron and that x-rays knock out electrons from the air particles

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3)proves the existence of neutrons and proved that the nucleus had another subatomic particle.

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3) explains the conversion of mass in chemical reactions

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3) Democritus was the first person to propose existence of atom

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3) Dalton didn't believe in the existence of the atom