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Period: 300 to 500
Various Greek scientist theorize
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400
Democritus discovers the atom
c. 400 - 370 BCE a Greek scientist and philosopher, named Democritus theorized a small, indivisible, things. Later called Atoms -
Period: Jan 1, 1300 to
Important Scientist
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Isaac Newton
Developed the Laws of Motion. -
Antoine Lavoisier
Proposed the Oxygen theory of combustion -
John Dalton
proposed the "Atomic Theory" where atoms were based on properties of mass. -
Michael Faraday
Studied what happened to solutions when elextricity was applie. Coined the term electrolysis. -
J. Plucker
Built the cathode ray tube, that was used in later experiments. -
Dmitri Mendeleev
Arranged the known elements into 7 specific groups. -
James Clerk Maxwell
proposed the idea that magnetic and electric fields filled the void between atoms. -
Sir William Crookes
Discovered various properties about the cathode ray tube, like how they travel in a straight line, and cause glass to fluoresce. -
E. Goldstein
Used a CRT to study canal rays. -
G.J. Stoney
Said the electricity was made of discrete negative particles. -
Wilhelm Roentgen
Found "X-rays" coming from a CRT that didn't get defleted by a magnetic field. -
J.J. Thomson
experimentally determined the charge to mass ratio of an electron, -
Ernest Rutherford
Found and named Alpha and Beta particles -
Marie Sklodowska Curie
discovered and coined the term "radioactivity" -
Max Planck
Used quanta to explain hot glowing matter -
Albert Einstein
Developed the equation E=mc2 -
Robert Millikan
Determined the charge carried by an electron -
Ernest Rutherford
Found that the nucleus was very dense and very small. Also assumed that electros were located outside the nucleus. -
Werner Heisenberg
Proposed Principle of Indeterminancy -
Erwin Schrodinger
introduced "wave mechanics" -
James Chadwick
Discovered neutral atomic particles -
Louis de Broglie
Made groundbreaking contributions to quantum theory. Had multiple theories. -
Niels Bohr
Developed an explanation of atomic structure -
Biblography
18 days. (2015, September 7). Retrieved September 17, 2015.
Buescher, L. (2004). Atomic Structure Timeline. Retrieved September 17, 2015.History of atoms. (2004, November 1). Retrieved September 17, 2015.
