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the first person to find the atoms and say atoms
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He helped make up the metric system.
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Law of Constant Composition
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HE FOUND OUT THE ATOMIC WEIGHT.
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he number of atoms it takes to make 12 grams of carbon
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the positive charged subatomic particle and found its mass
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radiation and radioactive decay
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inventing the Crookes tube
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Quantum Theory
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he found how fast the atom traveld.
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Bohr nuclear model of the Atom
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next step in atomic structure is nucleus with neutrons and protons in it.
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velocity and position of an electron at the same time.
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measurement of the charge on the eletrons.
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HE rearaged the Periodic
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research on radioactivity
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He is credited for the discovery of the electron and of isotopes, and the invention of the mass spectrometer
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his discovery of the netrons.
