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465 BCE
Democritus
Proved that when matter is broken similar properties stay. -
427 BCE
Plato
Proved that geometric forms serve as atoms. -
1200
The Alchemists
All metals were formed from 2 principles- Mercury and Sulfur -
Robert Boyle
Published "The Sceptical Chymist" relationship between pressure and volume of air. -
Antone Lavoisier
Matter was composed of atoms that were not created or destroyed -
John Dalton
Atomic theory of matter, law of multiple proportion. -
Billiard Ball Model
Atoms ball-like can't be divided any further, made by John Dalton. -
Amadeo Avogadro
Equal volumes of gases contain equal numbers of molecules and elemental gases composed of 2 atoms. -
Dmitri Mendeleev
Made the periodic table, which is a table with the elements arranged. -
JJ Thompson
Atoms are composed positively charge sphere with negatively charged electrons. -
Ernest Rutherford
Atom has small dense nucleus of protons and neutrons. -
Pierre and Marie Curie
Radioactive particles atoms breakdown and release radiation. -
Plum Pudding Model
Electrons negatively charged subatomic particles, made by JJ Thompson. -
Albert Einstein
Mathematically proved existence of atoms and their motion. -
Henry G.J. Mosely
Atomic number is positive charges in nucleus. -
Niels Bohr
Revolutionized understanding atomic structure and quantum theory. -
Robert Millikan
Discovered change of and individual electron and confirming existence. -
Solar System Model
Illustrate relative positions and motions of planets and moons. -
Erwin Shrodinger
Shrodinger equation, for energy levels of electrons to be calculated. -
Electron Cloud Model
Shows most probable position of electrons, by Shrodinger. -
James Chadwich
All matter us composed of different particles known as atoms.