-
427 BCE
Plato
Plato introduced the theory of geometric shapes called atoms which broke down into elements. -
420 BCE
Democritus
Democritus came up with the Idea that everything was made up of 'tiny bits' -
Jan 1, 1550
The Alchemists
The alchemists were famous for trying to turn items into gold. This caused them to research the structure of ores and give us a greater understanding of the molecules that build them up -
Robert Boyle
Robert Boyle reasoned that atoms must exist because gas could be compressed. -
Antoine Lavoisier
Antione said that matter is unable to be made or destroyed because something cannot be created from nothing so the reverse must be true. -
John Dalton
John Dalton proposed the idea of atoms in their name. He proposed that they were tiny indivisible pieces of elements, and that different elements would have different atoms. -
Amedeo Avogadro
Amedeo Avogadro had a law that stated equal volumes of all gases at the same temperature and pressure, have the same number of atoms. -
Billiard Ball Model
The billiard ball model was the first, and simplest model. It was a simple model where the atom was just a plain round ball. It was made by John Dalton. -
JJ Thompson
JJ Thompson introduced the Plum Pudding model in which there was positively charged 'pudding' and negatively charged 'plum' -
Plum Pudding model
The plum pudding model was created by JJ Thomson and had a positivly charged mass and small points of negatively charged "plum" -
Pierre and Marie Curie
Pierre and Marie Curie are famous for discovering the existence of radiation and the elements of polonium and radium. -
Dmitri Mendeleev
Dmitri Mendeleev Created the periodic table along with theorizing the properties of unknown elements. -
Albert Einstein
Albert Einstein was the first to calculate the size of an atom by using brownian motion -
Ernest Rutherford
Ernest Rutherford theorized that most of an atom was empty space, because of his experiment using gold foil and particle detecting sensors on either side. -
Solar System Model
The solar system model was made by Niels Bohr and had orbits of electrons circling around a mas of protons and neutrons -
Henry G. J. Mosely
Henry Mosely concluded that the atomic number of an atom was how many positive charges it had. -
James Chadwick
James Chadwick is famous for carrying out the experiment that allowed neutrons to be a confirmed concept. -
Niels Bohr
Niels Bohr proposed the idea of electron shells in which the farther away from the center of the atom you get the more energy is required -
Robert Millikan
Robert Millikan won the nobel prize for calculating the exact charge of an electron. -
Electron Cloud Model
The electron cloud model is the current model made by Erwin schrodinger in which there is positivly charged matter in the middle surrounded in a cloud of possible points for electrons -
Erwin Schrodinger
Erwin Schrodinger found that electrons did not stay stationary, and in fact moved around extremely fast in orbitals around the nucleus of the atom. -
Werner Heisenburg
Werner Heisenburg created the uncertainty principle in which he stated that no atom has a definite position, momentum or trajectory.
