-
The Alchemists thought all metal were made of sulfur and mercury and could turn into gold. -
Democritus believed atoms were uniform, solid, hard, incompressible, and indestructible -
Plato found out all elements had one of the following shapes, fire, air, water, or earth. -
Robert Boyle proposed that elements are composed of ‘corpuseles’ of various types and sizes -
Antoine Lavoisier discovered that oxygen was the main component in combustion. -
John Dalton created the atomic theory stating that atoms cannot be created nor destroyed -
Billiard ball model was made by John Dalton -
Amedeo Avogadro hypothesized that equal volumes of gases had equal amounts of pressure and temperature. -
Dmitri Mendeleev invented the periodic table according to atomic weight -
The plum pudding model was made by JJ Thomson -
Pierre and Marie Curie discovered the strongly radioactive elements polonium and radium. -
Albert Einstein mathematically prove the existence of atoms. -
JJ Thomson proposed a model atom which consisted with positive and negative charges and where present in equal amounts. -
Robert Millikan discover that there is a fundamental charge in the electron -
Ernest Rutherford discovered atoms must have a nucleus and made the planetary model. -
Henry Moseley self built equipment to prove that every elements identity was uniquely determined by the amount of protons. -
The solar system model was made by Niels Bohr -
Niels Bohr proposed the theory on why electrons orbit the nucleus -
Erwin Schrodinger discovered electrons have an area and are located in the atoms waves -
The electron cloud model was made by Erwin Schrodinger -
Hisenberg developed a key part of the quantum theory. -
James Chadwick discovered the neutrally charged subatomic particle.