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First person to think of the atom.
Thought atom was a solid circle. -
He thought everything was made of fire, earth, air, and water.
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He thought there were tiny pieces of mass.
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He came up with the atomic therapy.
All matter is composed of atoms. true
Atoms can not be made or destroyed. False
All atoms of the same element are identical. false
Different elements have different types of atoms. true
Chem. reactions occur when atoms are rearranged. true
Comp. are found from atoms of different elements. true -
He helped discover radioactivity.
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Discovered electrons.
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He measured the charge of a single electron.
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Discovered that an atom has a central positive nucleus.
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Discovered the Bohr model.
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Discovered isotopes and identified 212 natural isotopes.
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Discovered the formula that caculated the odds of where an electron might be.
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Discovered the Neutron.