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500 BCE
The Alchemists
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. -
428 BCE
Plato
Plato came up with the idea of elements and discovered matter comes from five main elements. -
400 BCE
Democritus
In the year 400 Democritus proposed the idea that all matter is made of atoms. -
Robert Boyle
In the year of 1640 Boyle proposed the idea that atoms existed. -
Antone Lavoisier
In the year of 1777 Lavoisier proved the theory of conservation of matter and explained the ideas behind fire. -
Billiard Ball Model
Since atoms were the smallest particles they were seen as small solid ball like a billiard ball. -
John Dalton
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. -
Amedeo Avogardo
In the year of 1811 Avogardo proposed the idea that equal volumes of gases have the same temperature and pressure. -
Dmitri Mendeleev
Came up with the periodic table. Played a major role in changing chemistry in Russia. -
JJ Thompson
Came up with the idea of charge to mass ratio of electrons, he also discovered the electron or the first subatomic particle. -
Solar System Model
A model described as a central mass of positive entity. -
Pierre and Marie Curie
Recognized and studied radioactive elements. Were the first people to win two Nobel peace prizes. -
Albert Einstein
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. -
Robert Millikan
In the year of 1908 Millikan discovered the charge of the electron -
Ernest Rutherford
Finalized the small dense positively charged nucleus. Also discovered that atoms were indestructible during the research with radioactivity. -
Neils Bohr
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. -
Henry G. J. Mosley
Developed the the idea of the number of protons in a element and the atomic number he also invented the first atomic battery. -
Erwin Schrodinger
Discovered the energy levels of electrons in atoms. Came up with the theory of Schrodinger's cat. -
Electron Cloud Model
A model of a atom in which where a electron would most likely be found. -
Heisenberg
In the year of 1927 Heisenberg formulated the quantum mechanics and developed the uncertainty principal. -
James Chadwhich
Discovered the existence of the neutron. Won a Nobel peace prize in physics -
Plum Pudding Model
Proposes the idea that electrons are surrounded by a volume of positive charge.