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1st person to think of the atom.
Thought atom was solid circle. -
Earth is composed of four elements water, fire, air, and earth.
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All matter is composed of atoms - T
Atoms cannot be made or destroyed - F
All atoms of the same element are identical - F
Different elements have different atoms - T
Chemical reactions occur when atoms are rearanged - T
Compounds are formed from atoms of diff elements -T -
Helped discover radioactivity.
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Proved existence of electrons.
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Was a tube of nothing hooked up to an electric charge. A beam of light resulted JJ held up a magnet to the beam and found the beam was charged.
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Measured a charge and mass of electroms.
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An atom has a central positive nucleus surrounded by negative orbiting electrons.
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Depicted a small positive nucleus surrounded by electrons are traveling in orbits.
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Discovery of Isotopes of non-radioactive elements.
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Atom consisted of nucleus and shells.
Proved Bohr model incorrect. -
Discovered the neutron.