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400 BCE
Democritus
Democritus came up with the idea that a atom is a basic building block and that they are uncuttable tiny solid particles in empty space. -
330 BCE
Solar System Model
The Solar System Model was first thought of in 330 B.C by Plato. The Solar System model is used to show you what our solar system looks like and the order of the plants from the sun. -
330 BCE
Plato
Plato started the solar system model. -
322 BCE
Aristole
He discovered that All matter is made of indivisible particles called atoms. -
1400
The Alchemists
The Alchemists broke down the chemical composition of the 4 basic elements fire, earth, wind, and water. This then became the modern day periodic table. -
Robert Boyle
Robert Boyle discovered that the volume of a gas decreases with increasing pressure and increases with decreasing pressure. -
Lavoisier
Lavoisier discovered that oxygen is key for combustion. He also discovered and named oxygen -
John Dalton
John Dalton created the Solid Sphere of Billiard ball model. He created the theory that atoms were indestructible. -
Solid Sphere of Billiard Ball Model
The solid Sphere of Billiard Ball model was invented by John Dalton that all objects are made of atoms that can not be divided into smaller particles. -
Dmitri Mendeleev
Dmitri Mendeleev made symbols for the chemical elements and put them in order with their atomic weight. -
The Curies
The Curies discovered the strong radioactive elements polonium and radium, which are naturally in uranium minerals. -
Plum Pudding Model
The Plum Pudding model was made by J.J Thomson to show atom with a positive charge with negative charges in the medium. -
J.J Thomson
He created the plum pudding model -
Albert Einstein
Albert Einstein in 1905 proved the existence of atoms through math. He also revolutionised science using statistics and probability.He also helped to understand the atomic theory. -
Robert Millikan
Robert Millikan discovered the elementary charge of an electron using the oil drop experiment. -
Ernest Rutherford
He discovered the nucleus of an atom. -
Neils Bohr
Neils Bohr started the theory that they hydrogen atom is that the energy is transferred in specific quantities based on the quantum theory. -
Henry G.J Mosely
He found that the major properties of an element are determined by the atomic number, not by the atomic weight -
Electron Cloud Model
The electron cloud model was made in 1925 by Erwin Schrödinger and Werner Heisenberg. The electron cloud model is used to to help you see the where the atoms would most likely be positioned. -
Werner Heisenberg
He discovered the Electron Cloud model
