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1900 Paul Villard discovers gamma-rays while studying uranium decay.1896 Wilhelm Conrad Röntgen discovers the X-rays while studying electrons in plasma scattering X-rays-that were considered as 'waves' of high-energy electromagnetic radiation- Arthur Compton will be able to demonstrate in 1922 the 'particle' aspect of electromagnetic radiation.1887 Heinrich Rudolf Hertz discovers the photoelectric effect that will play a very important role in the development of the quantum theory with Einstein's explanation of this effect in terms of quanta of light.1898 William Ramsay and Morris Travers discover neon, and negatively charged beta particles.
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Niels Bohr suggested that electrons move on orbits like planets around a sun.Ernest Rutherford later showed that most of the mass and all of the positive charge of an atom is found in a small dense core of the atom that we call the nucleus.JJ Thomson is credited with proving the first part of Dalton’s theory incorrect when he discovered the electron, as a result of his cathode ray tube experiment.His theory included the ideas that atoms make up all matter, are indivisible, and that atoms of an element are identical. John Dalton completed scientific experiments to develop his atomic model with evidence.He is also credited with using the word " atomos" to describe a small unit of matter that was unbreakable. Democritus is often credited with the first atomic theory, though it was a philosophical idea without evidence.
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You can add more than one template to this assignment to give students lots of options! Suggested Scientists They can also describe the major advancements in each description box to make as detailed or general a timeline as is required by the level of chemistry they are studying.įor an alternative to the timeline layout, have students create a timeline poster to incorporate into a presentation or gallery walk. Students can upload pictures of these scientists or, in some cases, of their equipment, using Photos for Class. They should be sure to include a variety of different scientists and discoveries related to atomic theory in their timeline. Using a timeline layout, students will illustrate major atomic developments and outline how ideas changed over time. It is a valuable experience for students to understand that scientific ideas evolve over time in response to new and better data. Many lessons on atomic structure begin with a recitation of the historic developments that led to the current theory.