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Atomic Theory Scientist Timeline
Transcript of Atomic Theory Scientist Timeline
He was a Greek philosopher who believed that the universe was made of tiny " uncuttable " particles.
Democritus 370 BC
He discovered that atoms are mostly empty space and that the proton has a positive charge. He did the Gold Foil experiment.
Ernest Rutherford 1911
He created a model of the atom in which electrons moved around the nucleus in a fixed orbit.
Niels Bohr 1915
Worked with The Quantum Theory. He discovered the uncertainty principle which is when a particle's position, energy and time can never be precisely known.
Werner Heisenberg 1927
Discovered the neutron. He was the head of British scientists who worked on the development of the atomic bombs during WW II. He also found the missing mass of the atom's nucleus by finding the sum of the protons and neutrons.
James Chadwick 1932
- Democritus 370 BC
- John Dalton 1803
- Dmitri Mendeleev 1869
- J.J. Thomson 1897
- Ernest Rutherford 1911
- Niels Bohr 1915
- Werner Heisenberg 1927
- James Chadwick 1932
He came up with the atomic theory, which states that matter is made up of atoms. He hypothesized that atoms of a given element are identical, as well as a tiny hard sphere.
John Dalton 1803
Created the first periodic table of elements and organized them in order based on their atomic weight and were put into rows and columns based on chemical and physical properties. He was determined that the properties of elements are periodic, (or in trends.)
Dmitri Mendeleev 1869
He discovered the electron by using the cathode ray tube. He created the "plum pudding" model of the atom. Based on this model, the atom is made up of electrons which is encircled by positive charge that balance the electrons.
J.J. Thomson 1897
by: Brittany Medellin Science 5th Pre-Ap Anchondo