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First person to think of the atom.
Thought the atom was a solid circle. -
Tiny pieces of mass "swimming" everywhere
(he agreed with Democritus) -
All matter is composed of atoms - true
Atoms cannot be made or destoryed - false; an atom can be split
by a nuclear reaction
All atoms of the same elements are idenctical - false; isotopes
Different elements have different types of atoms - true
Chemcial reactions occure when atoms are rearranged - true
Compunds are formed from atoms of different elements - true -
Helped discover radioactivity
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Proved the existence of negatively charged atoms ( electrons )
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Measured charge and mass of electron.
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An atom has a central positive nucleus surrounded by negative orbiting elements.
He was credited with the nucleus and proton. -
His electrons are traveling in orbits.
Decided atom was a small, positively charged nucleus surrounded by electrons. -
Discovered isotopes of non-radioactive elements.
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Found the atom consist of nucleus aned cloud.
Discovered the formula that calculated the odds of where the electron might be.
Proved Bohr's model incorrect. -
Discovered the nuetron.
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Thought everything was made up of fire, air, earth, and water instead of atoms