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Discovered a substance that would transmute the more common metals into silver or gold -
Plato came up with elements -
The theory posited that matter is all made up of small indestructible units called atoms -
Discussed the possibilities of atoms existing he studied mainly gases he proposed that elements are composed of "corpuscles" of various sizes and types that can be able to organize into groups that represent different chemical substances -
French Chemist who proved conservation of matter and also explained the mysteries of fire -
Proposed that compounds were atoms from different elements combined together and consisted of atoms that were identical and also had the same mass -
Dalton at the time thought atoms were the smallest particles of matter and envisioned them as solid hard spheres -
The equal volumes of gases at the same temperature contain equal numbers of molecules. -
Created periodic table -
J.J determined the charge to mass ratio of electrons -
They discovered polonium and Radium -
Negatively charged electrons are surrounded by positively charged which was proposed by J.J Thompson -
Proposed the quantum of light in which he states that light is like a particle and also has a wave nature that is giving a dual nature. Also started the equivalence of energy and mass through the theory of special relativity -
Discovered the charge of an electron with his oil drop experiment -
Concluded a small dense positively charged nucleus as the result of the alpha particles scattering gold experiment -
Ernest Rutherford proposed that atoms are act like a solar system -
Proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit -
Henrey discovered that the number of protons in an element an its atomic number -
Had the theory of quantum mechanics -
Erwin formulated a wave equation that accurately calculated the energy levels of electrons in atoms. -
The model explains that we can't know where the electron is at any given time but the electron sare more likely in the specific areas proposed by Erwin Schrodinger -
James proved the existence of neutrons