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The Alchemists broke down the chemical composition of the 4 basic elements, fire, earth, wind and water. They created the foundation of the modern day periodic table -
Democritus theorised that all material bodies are made up of indivisibly small atoms. He was a central figure in the development of the atomic theory of the universe -
Plato said atoms must derive from these 5 fundamental solids. He predicted that a 5th atomic type must exist, which was later called Ether. -
The Solar System Model was created by astronomer Nicolaus Copernicus -
He came up with the idea of the element. He used experimentation to understand atoms and elements. -
Antoine Lavoisier determined that oxygen was a necessary substance in combustion, and he gave the element its name. He was known as the father of modern chemistry. -
John Dalton developed methods to calculate atomic weights and he had an atomic theory which stated that, all matter is made of atoms. -
The Billiard Ball Model was created by John Dalton -
Amadeo Avogadro hypothesised that equal volume of different gasses contain the same number of molecules and they are at the same temperature or pressure. -
Dmitri Mendeleev created the periodic classification of the chemical elements in which elements were arranged in order of increasing atomic weight. -
JJ Thompson experiments with ray tubes conveyed that all atoms have small negatively charged subatomic electrons or particles -
The plum pudding model was created by Sir Joseph John Thomson -
Pierre and Marie Curie discovered the strongly radioactive elements polonium and radium which occurs naturally in uranium minerals. Maria penetrated rays by certain atoms. -
He proved the existence of atoms by using math. He also revolutionised science using statistics. -
Robert Millikan successfully determined the magnitude of the electrons charge. He showed by measuring how the various drops of oil moved around. He showed that their charge was always a multiple of a precisely determined charge. -
Ernest Rutherford is known for his pioneering studies of radioactivity and the atom. He discovered the 2 kinds of radiation, alpha and beta particles coming from Uranium. -
Niels Bohr proposed a theory for hydrogen based on quantum theory. He also made a model that explained why atoms only emit light fixed on wave lengths. -
Henry G.J. Mosely used equipment he made himself to show that all elements identity is uniquely determined by the number of protons. -
The Electron Cloud Model was created by Erwin Schrodinger -
James Chadwick discovered the neutron. This discovery eventually led to the creation of the atomic bomb. -
Werner Heisenberg formulated Quantum mechanics in terms of matrices and in discovering the uncertainty Principle, which says that the position of a particle and momentum can't be exactly known. -
Erwin Schrodinger used mathematical equations to describe the probability of seeing an electron in a certain position.