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500 BCE
The Alchemists
The Alchemists broke the 4 elements down into the periodic table and stated the atomic theory. They did this by using the periodic table elements. -
Period: 500 BCE to
Atomic timeline
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430 BCE
Democritus
He theorized that all bodies are made of super small atoms which was a central figure to the atomic theory. -
427 BCE
Plato
He theorized that atoms of matter come from the 5 fundamental solids. He also guessed that a fifth atom would come called ether. -
1543
Solar System Model
Made by Nicolaus Copernicus -
Robert Boyle
He defined the modern idea of an element and helped use experimentation to understand atoms and elements. -
Antone Lavoisier
He determined oxygen was an essential substance in combustion. He was the father of modern chemistry and gave an element a name. -
John Dalton
Had the theory of law of conservation of mass and constant composition with 4 parts to the theory. Also was the first complete time describing the matter in terms of atoms and their properties. -
Billard Ball Model
This was made by John Dalton -
Amedeo Avogadro
He hypothesized that equal volumes of different gases contain equal numbers of molecules with the same pressure and temperature. -
Dmitri Mendeleev
He created the periodic classification of chemical elements. It was in an order of atomic weight. -
Plum Pudding Model
This was made by Sir Joseph John Thomson -
Pierre and Marie Curie
They discovered strong radioactive elements, radium and polonium. Marie forced radioactivity by certain atoms -
Albert Einstein
He proved that atoms existed mathematically and helped revolutionize science through statistics. -
Robert Millikan
He determined the magnitude of electrons charge and did it by measuring the oil drops that moved about. -
Ernest Rutherford
He was known for pioneering states of radioactivity and the atom. The founded atoms consisted mostly of empty space -
Neils Bohr
Neil purposed the theory for the hydrogen atom and the theory was based on the quantum theory -
JJ Thompson
He experimented with ray tubes that showed how all atoms contain negatively charged particles or electrons. -
Henry G.J Mosely
He used self-built equipment to prove that every element is uniquely determined by the number of protons it has. -
Electron Cloud Model
Made by Erwin Schrodinger -
James Chadwick
He discovered the neutron and this discovery led to the development of the atomic bombs. -
Werner Heisenberg
He formulated quantum mechanics in terms of matrices. Also included discovering the uncertainty principle that stated a particles position and momentum cannot be known exactly. -
Erwin Schrodinger
He took Bohr atom model and helped describe a electrons certain position using mathematical equations.