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First person to think of the atom.
Thought the atom was a solid circle. -
Proposed that everything was made of fire, earth, air , and water instead of atoms.
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Believed that there were little tiny pieces of mass that were swimming everywhere.
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Made the Atomic Theory.
all matter is composed of atoms (T)
atoms cannot be made or destroyed (F)
atoms of the same elements are identical (F)
different elements have different types of atoms (T)
chemical reactions occur when atoms are rearranged (T)
compounds are formed from atoms of different elements (T) -
Helped discover radioactivity.
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Proved the existence of negatively charged particles, later called electrons
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Measured the charge and mass of a single electron.
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An atom has a central positive nucleus surrounded by a negative orbiting nucleus.
Credited with nucleus and also the proton. -
Depicted atom as small, positively charged nucleus surrounded by electrons.
Electrons traveling in circular orbits. -
Discovered isotopes of non-radioactive elements.
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Discovered the formula that calculated the odds of where an electron migth be.
Atom consists of nucleus and clouds.
Proved Bohr model incorrect. -
Discovered the neutron.