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The Alchemists found a substance that could transmute common metals to silver and gold -
Democritus proposed that all matter is made up of small indestructible units -
Plato discovered that there was a common element shared between earth, air, fire, and water -
Boyle discussed the existence of atoms and defined elements and compounds -
Boyle discussed the existence of atoms and defined elements and compounds. -
Lavoisier proved the theory of conservation of matter by measuring reactions within a sealed container -
John Dalton proposed the theory that compounds were made up of of combined elements -
Dalton proposed that compounds were composed of multiple elements combined
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Model envisioned by Dalton, who thought that atoms were small hard spheres -
Mendeleev created the first form of the periodic table -
Thompson was able to calculate the ration of charge to mass in an electron -
The Curies discovered the radioactive elements radium and polonium -
An atomic model proposed by JJ Thompson which suggested that electrons exist within a positively charged jelly. -
Einstein was able to prove the existence of atoms by observing particles suspended in fluids -
Einstein was able to prove that atoms existed by observing small particles in fluids
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Millikan discovered the fact that electrons are negatively charged with the oil drop experiment -
Rutherford concluded for his experiment that atoms have a small nucleus with a positive charge -
Atomic model proposed by Rutherford which stated that atoms contain a tiny, dense, positively charged nucleus which is orbited by electrons -
Neils Bohr proposed an atomic structure theory in which the outer orbit is able to hold more than the inner orbit -
Bohr proposed an atomic structure where the outer orbit can hold more than the inner orbit
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Mosely determined that the amount of protons in an atom is what determines the atomic number of said atom -
Schrodinger discovered that it is possible to find the quantity of hydrogens energy with an equation called schrodinger's equation -
Chadwich discovered the neutrons, which are neutrally charged particles within the atoms nucleus