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460-370 B.C.
He said " Atoms cannot be created, destroyed, or further divided."
He also said atoms move through empty space. -
384-322 B.C.
He disagreed with the idea that atoms move through empty space.
He completely denied the existence of atoms.
His ideas overtook Democritus' idea about matter. -
He revised Democritus' ideas based on his own research.
He said "atoms are the smallest particles of matter and are indivisible and indestructible."
To explain the conservation of mass he said "atoms can be rearranged, separated, or combined to form new things, but cannot be created, destroyed, or divided in the process." -
He saw a green flash of light in a cathode ray tube and discovered what are now called electrons.
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He designed a series of CRT experiments to determine particle charge to mass ratio.
He disproves Dalton's theory about atoms are invisible.
Received Nobel peace prize in 1906 for his research discovery of electron. (The first subatomic particle) -
He designed an oil drop apparatus to tell the charge of atom.
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He discovered that the atom was mostly an empty space for electrons to move in. His model shows the neutral nature of matter with the balance of positive charges in nucleus and negative charges of electrons around the nucleus.
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He found neutrons
