-
340
Aristotle
Believed all substances were made of Fire, Air, Water and Earth. -
395
Democritus
Adopted the formulation of an atom theory of the Universe. The theory stated that there were two elements: atoms and the void in which they exist and move. https://www.youtube.com/watch?v=TgWn91ap99A -
Antonie Lavosier
Known for his discovery in the role oxygen plays in combustion. -
Joseph Proust
Got his own law and said that chemical substances combine to form a small number of compounds. -
John Dalton
Made a Atom Theory that is thought to be true in modern day. All matter is made of atoms and much more. https://www.youtube.com/watch?v=wsYDL6EjV4k -
Amadeo Avagadro
Best known for his hypothesis that equal volumes of different gases contain an equal number of molecules, provided they are at the same temperature and pressure. -
William Crookes
Discovered the element Thallium and known for his cathode-ray studies. -
Henri Becquerel
Discovered radioactivity which was an early part of the atomic theory. -
J.J. Thomson
Discovered the electron and studied positively
charged particles in neon gas. -
Madame Curie
Studied radium and radiation that was an instrumental technology for the future and development of the atomic bomb. -
Albert Einstein
Treated matter and energy as exchangeable and became famous for his Theory of Relativity. This acted as a base for the release of atomic energy. https://www.youtube.com/watch?v=9BFKqIoqSIY -
Ernest Rutherford
His Gold Foil Experiment demonstrated that atoms contained a charged nucleus. -
Henry Moseley
His discoveries helped position the elements more correctly on the periodic table from their atomic numbers. -
Niels Bohr
Created a model that showed that an atom is a small, positively charged nucleus surrounded by orbiting electrons. https://www.youtube.com/watch?v=Ucs1Nluy9N4 -
Robert Millikan
He had an oil drop experiment that helped quantify the charge of an electron. This experiment also helped people understand the structure of an atom -
Max Planck
Best known as the originator of the quantum theory. This work helped people with the understanding of the atomic and subatomic processes. -
Louis deBroglie
Research on quantum theory and predicting the wave nature of electrons. -
Werner Heisenberg
Due to his theory of quantum mechanics, the allotropic forms of hydrogen was discovered. -
Erwin Schrodinger
Developed an Electron Cloud Model. -
James Chadwick
Figured out that there was an uncharged particle called a neutron. https://www.youtube.com/watch?v=73JJRLd8Yio
