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100
Kanada (BCE)
Kanada the idea that matter was made of atoms that were invisible. He believed all atoms are different and none are the same. Atoms make up water, fire, earth and air. -
460
Democritus (BC)
Demorcritus invented the whole theory of the atom. He said that all matter is made up tiny particles called atoms. Till this day we still believe that atoms are real and most people learn about atoms. -
Jan 1, 624
Thales (BC)
He researched and discovered more about the atomic model. He believed water was the basis of all material. -
Isaac Newton
Isaac Newton created the theory of gravity. He did a lot of tests and research and after spending a lot of time he created the theory of gravity. Till this day we believe in gravity and we believe gravity keeps us on the ground. -
Antoine Lavoisier
Antoine Lavoisier created the theory of water and hdyrogen and 33 other theories that we still use today. He created this theory of doing many expirements -
John Dalton
John Dalton made the Dalton's Atomic theory. In the theory he said that all matter is made from atoms, all atoms are invisible and indescribable because no one has ever seen them. All atoms of a given element are Identical in mass and properties. Compounds are formed by a combination of two or more different kinds of atoms. A chemical reaction is a rearrangement of atoms.
We still use this theory today. -
Robert Brown
Robert Brown discovered the different parts of microscope particles and how they are suspended in a liquid or gas.
He also discovered the tiny particles in water and other materials like carbon and metals. -
Robert Bunson
Robert Bunsen joined the University of Heidelberg.While he was there he heated chemicals to the point they glowed and made other colours. -
Joseph John Thomson
J.J. Thomson discovered the concept on the heavy, solid, invisible atom and replaced it with the concept that the atom was made out of smaller particles.
This is still been studied till this day. -
Ernest Rutherford
Ernest Rutherfprd discovered the positively charged particle the proton but discovered that atoms have a nucleus.
With this information he made a model of what he thought an atom would look like and it looked like a solar system. -
Hans Geiger
Hans Geiger worked on nuclear reactions, including the carbon-nitrogen reaction.
He also invented a device that can detect alpha particles. -
Niels Bohr
Niels Bohr made an atom structure that stated the outer orbit of an atom could hold more electrons than the inner orbit.His research also showed there were positive and negative charges in the atoms. -
Ernest Marsden
Ernest Marsden made the theory of the artificial transmutation of the elements. He did this/ proved this by doing many different expirements. -
Aristotle (BC)
Aristotle theory was all matter was made up of fire, water, earth and air. He believed these elements had different qualities and they were dryness, hotness, coldness and moistness. -
Empedocles (BC)
Empedocles believed the theory of elements based on air, fire, earth and water.This theory grew later on.
