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500 BCE
The Alchemists
Believed that mundane elements could be changed into gold and they were all made of the same material -
430 BCE
Democritus
He said that atoms did different things and caused different emotions or shapes -
427 BCE
Plato
He theorized that all things are made of small geometric shapes -
Robert Boyle
Proposed that all things were made of atoms or corpuscles -
Antoine Lavoisier
He proved that mass cannot be created or destroyed only changed from one form to the next -
John Dalton
Proposed the atomic theory that said all things were made of small invisible building blocks -
Amedeo Avogardo
He found out that different gasses had the same amount of molecules. -
Dimitri Mendeleev
Developed a way to catalog all known elements in the "periodic table -
Pierre and Marie Curie
They discovered Radium and Polonium -
JJ Thompson
Made the plum pudding model, a theoretic description of the atom -
Albert Einstein
Proved that atoms exist by calculating the force on pollen in water -
Ernest Ruthford
He discovered that all atoms are mostly empty, he also learned about the nucleus -
Neils Bohr
Discovered the hydrogen atom, He also discovered a way to measure subatomic particles -
Henry G J Mosley
Concluded that all protons are positively charged and are a part of the nucleus. He also altered the atomic timeline. -
Erwin Schrödinger
He developed a method to measure energy in electrons with a formula. -
Anton Heisenberg
He Developed an equation to calculate the energy levels in atoms -
James Chadwich
Developed the billiard ball model and discovered neutrons