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500 BCE
The Alchemists
They connect to the atomic theory because they believed all metals were formed from 2 principles mercury and sulfur. also they attempted to purify matter. -
427 BCE
Plato
He contributed to atomic theory because he believed solid forms of matter are composed of indivisible elements shaped like triangles ( atoms). Founded the academy a philosophical school. -
400 BCE
Democritus
he connects to atomic theory because He believed atoms were uniform, solid, hard, incompressible, and indestructible. Also he believed they moved in infinite numbers. He also was the father of modern science. -
330 BCE
Solar System model
Is a model that shows how the planets are arranged around the sun. Invented by Heraclides -
Robert Boyle
He contributes to atomic theory because he believed everything was composed of very tiny particles he called them corpuscles. was a founding fellow of the royal society. -
Antone Lavoisier
He contributed to Atomic theory because he defined that matter was composed of atoms that are not created or destroyed during chemical reactions. He also established the law of conservation of mass. -
John dalton
He introduced the Atomic theory. He was an English chemist, physicist, and meteorologist. -
Billiard Ball Model
Referred to as the Dalton model of an atom. Is defined an atom to be a ball like structure. Created by John Dalton. -
Amedeo Avogadro
He contributed to atomic theory by stating that equal volumes of gases at the same temperature and pressure have the same amount of molecules no matter what. He was also the first scientist to discover the existence of elements in the form of molecules. -
Electron Cloud model
Electron cloud model is a model that explained the area around an atoms nucleus where electrons are most likely found. Invented by Erwin Schrödinger and Werner Heisenberg. -
Dmitri Mendeleev
He contributed to atomic theory by creating the periodic law. Also he was father of the periodic table. -
JJ Thompson
He connects to atomic theory because He discovered the electron. He also got the Nobel prize in physics. -
Pierre and Marie Currie
They connect to Atomic theory because they said the rays in polonium and radium gave of were small atoms. They discovered those two elements. -
Plum Pudding Model
Plum Pudding model explains that electrons are negatively-charged particles embedded in a sea of positive. Invented by JJ Thompson. -
Albert Eienstein
He contributed to atomic theory by predicting the size of an atom and molecule. He was known for quantum theory of relativity. -
Robert Millikan
He connects to atomic theory because he discovered the value of elementary charge. He also won the Nobel prize for physics in 1923 -
Ernest Rutheford
He contributed to atomic theory by developing the idea of a nucleus with a positive charge. He also won a Nobel prize in 1908 -
Neils Bohr
he contributed to atomic theory by discovering how the atom was layed out. He also got a Nobel prize for physics in 1922 -
Henry G.J Mosely
He contributed to atomic theory by discovering atomic number. Also he was killed in world war ll. -
Erwin Schrödinger
He contributed to atomic theory by formulating a wave equation that calculates the energy level of electrons in an atom. He also shared a nobel prize with Dirac in 1923. -
James Chadwich
He contributes to atomic theory because he discovered the neutron. he also got a Nobel prize in 1935.