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In the year of 500bc, The Alchemists started testing Aristotle's theory of atomic. Shortly after they tried to treat different metals or ores to create something more valuable. -
Plato came up with the idea of elements and discovered matter comes from five main elements. -
In the year 400 Democritus proposed the idea that all matter is made of atoms. -
In the year of 1640 Boyle proposed the idea that atoms existed. -
In the year of 1777 Lavoisier proved the theory of conservation of matter and explained the ideas behind fire. -
Since atoms were the smallest particles they were seen as small solid ball like a billiard ball. -
In the year of 1803, John Dalton brought up the idea that all matter was made up of atoms. And that all atoms were the building blocks that no one can see and can not be destroyed. -
In the year of 1811 Avogardo proposed the idea that equal volumes of gases have the same temperature and pressure. -
Came up with the periodic table. Played a major role in changing chemistry in Russia. -
Came up with the idea of charge to mass ratio of electrons, he also discovered the electron or the first subatomic particle. -
A model described as a central mass of positive entity. -
Recognized and studied radioactive elements. Were the first people to win two Nobel peace prizes. -
In the year of 1905 Einstein proposed the idea quantum light has a wave nature that gives out a certain amount of matter it posses. Started the idea of energy of mass theory. -
In the year of 1908 Millikan discovered the charge of the electron -
Finalized the small dense positively charged nucleus. Also discovered that atoms were indestructible during the research with radioactivity. -
In the year of 1913, proposed the idea of atomic structure theory, that the outer orbit of the atom can have more electrons than the inner section. -
Developed the the idea of the number of protons in a element and the atomic number he also invented the first atomic battery. -
Discovered the energy levels of electrons in atoms. Came up with the theory of Schrodinger's cat. -
A model of a atom in which where a electron would most likely be found. -
In the year of 1927 Heisenberg formulated the quantum mechanics and developed the uncertainty principal. -
Discovered the existence of the neutron. Won a Nobel peace prize in physics -
Proposes the idea that electrons are surrounded by a volume of positive charge.