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500 BCE
Alchemist
develop the theory that all metals are composed of mercury and sulfur and that it is possible to change base metals into gold. -
442 BCE
Democritus
Greek philosopher, who develop the atomy theory of the universe, his atomy theory anticipated the modern principles of the conservation of energy and the irreducibility of matter. -
400 BCE
Aristotle
Aristotle was a Greek philosopher and polymath during the Classical period in Ancient Greece. Taught by Plato, he was the founder of the Lyceum, the Peripatetic school of philosophy, and the Aristotelian tradition. His writings cover many subjects including physics, biology, zoology, metaphysics, logic, ethics, aesthetics, poetry, theatre, music, rhetoric, psychology, linguistics, economics, politics, and government -
427
Plato
According to which atoms broke down mathematically into triangles, such that the form elements had the following shape .fire (tetrahedron), air (octahedron), water (icosahedron), earth (cube). -
Robert Boyle
Is know as ''The father of chemistry '' for his discovery that atoms must must exist based on the relationship between pressure and volume of gas . -
Solar System Model
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Antoine Lavoisier
Antoine Lavoisier was known for identified the combustion, identifies oxygen, hydrogen he is credited as being the first person to make use of the balance and he came up with the law of conservation. -
Solid Sphere of Billiard ball Model
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John Dalton
Was an English chemist, physicist, and meteorologist. He is best known for proposing the modern atomic theory. "Elements consisted of atoms that were identical and had the same mass and that compounds were atoms from different elements combined together." -
Dmitri Mendeleev
He is best remembered for formulating the Periodic Law and creating a farsighted version of the periodic table of elements. -
J.J Thomson
Sir Joseph John Thomson OM PRS was a British physicist and Nobel Laureate in Physics, credited with the discovery of the electron, the first subatomic particle to be discovered. -
The curies
Pierre Curie and his wife Marie Curie started that radioactive materials cause atoms to break down spontaneously, realizing radiation in the form of energy particles. -
Plum Pudding Model
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Albert einstein
born in Ulm, Germany, and lived from 1879-1955.,Einstein's biggest contribution to the Atomic Theory was that he was able to fully prove through usage of evidence that atoms did indeed exist, and he was also able to demonstrate that electrons could leave metal through usage of light. He also created the mass energy equivalence equation, and this paved the way for the creation of the atomic bomb. -
Robert Milikan
Robert Millikan's primary contribution to atomic theory came as a result of his oil-drop experiment, which measured an electron's charge. Previously, J.J. Thomson had suggested the hypothesis that an electron's mass was at least 1,000 times less than the mass of the tiniest atom. -
Ernest Rutherford
The model described the atom as a tiny, dense, positively charged core called a nucleus, in which nearly all the mass is concentrated, around which the light, negative constituents, called electrons, circulate at some distance, much like planets revolving around the Sun. -
Neils Bohr
Made numerous contributions one of them was. Atoms are mostly empty space with a positively charged nucleus surrounded by electrons that travel in circular orbits (like the solar system.) -
Henry G.J Mosely
Was an English physicist, whose contribution to the science of physics was the justification from physical laws of the previous empirical and chemical concept of the atomic number. -
Electron Cloud model
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Werner Heinenber
5 December 1901 – 1 February 1976) was a German theoretical physicist and one of the key pioneers of quantum mechanics contributed to atomic theory through formulating quantum mechanics in terms of matrices and in discovering the uncertainty principle, which states that a particle’s position and momentum cannot both be known exactly.
