1. Democritus Date of Discovery or introduction of ideas:
Circa 460 BCE- circa 370 BCE
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Came up with the idea that everything is made up of smaller indivisible structures. Also said that combinations of 4 basic “elements” create every substance on our planet.
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Air
Fire
Earth
Water

2. John Dalton Date of Discovery or introduction of ideas: 1803
What was their idea: The identifying and naming of elements with symbols to represent them.
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3. JJ Thompson Date of Discovery or introduction of ideas: 1906
What was their idea: Thompson came up with the idea that the atom has both positive and negative parts. He did not understand exactly how the were situated by one another.
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4. Ernest Rutherford Date of Discovery or introduction of ideas: 1917
What was their idea: He came up with the idea that there is space between the nucleus of an atom and the electrons by doing a gold foil experiment.
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5. HGJ Moseley Date of Discovery or introduction of ideas: 1913
What was their idea: He came up with the idea of the atomic number representing the elements protons and electrons. This helped redesign Mendeleev’s Periodic Table. He is also responsible for the discovery of the X-Ray.
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6. Niels Bohr Date of Discovery or introduction of ideas: 1912
What was their idea: He designed a model of the atom that we still use today. It is sometimes called the planetary model. (Because it looks like the solar system.)
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7. Louis deBroglie Picture or formula of their work: 1924
What was their idea: Developed a 3-Dimentional model of the atom . Considered the best modern model in chemistry today. The model is called the cloud model.
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8. Demetri Mendeleev Date of Discovery or introduction of ideas: 1860’s
What was their idea: He developed the first periodic table of elements. He used only 62 elements, but realized that there were more. He organized it by atomic mass.
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9. Marie Curie Date of Discovery or introduction of ideas: 1911
What was their idea: Discovered the medical uses of radioactive materials and the idea of radioactivity.
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10. Enrico Fermi Date of Discovery or introduction of ideas: 1939-42
What was their idea: Designed an built the first atomic weapon that helped end WWII. The bombs were dropped on Nagasaki and Hiroshima, Japan and caused massive destruction to those areas.
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