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Democritus (460 BC-350BC) was a Greek philosopher who thought that all matter was made of tiny indivisible particles he called atomos.
John Dalton, in the early 1800’s, gave us his version of the atomic theory.
J.J. Thomson, a physicist, did a series of experiments with cathode ray tubes that proved the existence of the electron.
Thomson continued to experiment and postulated that the atom looked like plum pudding (think chocolate chip cookie) with protons and electrons in it.
Ernest Rutherford was a student of Thomson and wanted to learn more. He conducted the gold foil experiment and found the existence of the dense, positively charged nucleus.
Niels Bohr worked with Rutherford and went one step further. He said the electrons were located in energy levels and gave us the planetary model.
We progressed beyond the Bohr planetary model to today’s model – one in which electrons are at specific energy levels but are known to always be in motion and not orbiting the nucleus.
Atomic Theory Timeline
Atomic Theorists How we got to where we are now. Law of Conservation of Mass Matter can’t be created or destroyed Who: Antoine Lavoisier When: 1785 Where:
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History of the Atomic Theory
History of Atomic Theory 1
The History of Atomic Theory
By: Amina Al-Naama 7D. An atom a fundamental piece of matter. Everything in the universe except energy is made of matter, and, so, everything in the universe.
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+ ATOMIC THEORY. + Democritus Atom Democritus is an Ancient Greek philosopher born in Abdera, Thrace, Greece He was said to be the first step toward the.
Development of our understanding of the atom. Early Models Democritus was first to suggest atom in 4 th century B.C. Believed matter was made of tiny.
History of Atomic Structure
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Chapter 4: Discovery of Atomic Structure. Prentice Hall © 2003Chapter 2 The Discovery of Atomic Structure An ancient Greek named Democritus was the first.
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