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First person to wonder what made up the world around us.
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First person to think of an atom.
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He thought everything was made up of fire, air, water, and earth.
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He contributed to atomic theory.
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He developed an atomic theory.
1. All matter is made up of tiny particles called atoms.
2. All atoms of a given element are alike, but are different from the atoms of any other element.
3. Compounds are formed when atoms of different elements combine in fixed proportions.
4. A chemical reaction involves a rearrangement of atoms, not a change in the atoms themselves. -
He discovered radioactivity.
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He discovered the electron and developed the plum pudding model.
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He performed the oil drop experiment and found the charge of individual electrons.
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He performed the gold foil experiment and discovered the nucleus.
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He discovered that electrons have orbits.
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He invented the mass spectrograph and discovered isotopes.
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He used math equations to find the probability that an electron would be in a certain location.
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He discovered the neutron.
