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First person to think of the atom
Thought atom was a solid sphere -
Everything is made up of 4 elements.
They are earth, air, fire, and water -
He believe that there were tiny pieces swimming. (Atoms)
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True- All matter is composed of atoms. Different elements have different typees of atoms. Compounds are from atoms of different atoms. Chemical reactions occur when atoms rearranged`
False- All atoms of same elements are identical. Atoms cannot be made or destoryed. -
helped discover radioactivity
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Proved the existence of electrons
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meausred change and mass of electron
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Proved nucleus was in the middle.
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Electrons travel in circular orbits.
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discovering of isotopes of non radioactive element
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discovred formula that calcualtes the odd of electron might be
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discovered the nuetron