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620 BCE
He was the 1st person to investigate basic principles of the atom (beginning of atom). -
440 BCE
He did a mental experiment called "Cutting the Cheese".
He mentally cut it down into halves until it couldn't get any smaller, and the smallest peice would be an atom.
He also created the 1st atomic theory. -
340 BCE
He didn't believe in the atomic theory.
More believed his ideas, than Deomocritus because of social ranking. -
Atomic Theory: Matter is made up of atoms.
Matter is made up of solid, massy paritcles.
Atoms are held together by attraction/forces. -
He discovered radiation.
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He did an Oil Drip Experiment that found the charge of individual electrons.
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He also performed the Gold Foil Experiment that discovered protons and the nucleus.
In 1911 he found the nucleus.
In 1919 he found the proton. -
He discoverd Isotopes.
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He used math equations to find the probability that an electron would be in a certain positiion.
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He discovered the neutron.
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He created a theory on electrons, which means electrons have to stay in their specific orbit.
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Atomic Theory Experiment:
a) All matter is made up of tiny particles called atoms.
b) All atoms of a given element are alike, but are different from other atoms of any element.
c) Compounds are formed when atoms of different elements combnied in fixed proportions.
d) A chemical reaction involves a rearrangement of atoms, not a change in the atoms themselves.
