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First person to think of the atom.
Thought atom was a solid sphere. -
Determined that all things were made up of fire, water, earth, and air.
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Thought everything was made up of atoms.
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True: All matter=atoms
False: Atoms=no destroy
False: Atoms of same element=identical
True: Diff. elements= different atoms
True: Chem. reaction=atoms rearranged
True: compounds=atoms of different elements -
Helped discovery radioactivity
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Found electrons
Thought atoms looked like plum pudding -
Measured the charge and mass of electron
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Central position- nucleus surrounded by negative orbiting electrons.
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Depicted atoms as small, positively charged nucleus surrounded by electrons- moved in circular motion
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Discovered isotopes of non-radioactive elements
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Discovered formula that calculated the odds of where an electron might be.
Proved Bohr model incorrect -
Discovered the neutron