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400 BCE
Democritus
He believed the atom was unchangeable, industructible and always existed -
355 BCE
Plato
He found that geometric forms serve as atoms -
122 BCE
The Alchemists
They expiremented with metals to change their atomic structure to become more valuable -
Robert Boyle
He made the law of gases. The law of gases states that gases stay the same with constant temperature. -
Solar system model
Shows how atoms make up the univers -
Antoine Lavoisier
He found that by combining Phosphorus and Sulfur with air they gained weight. -
John Dalton
He described that all matter was made up of atoms for the first time. -
Billiard Ball model
The balls were examples of atoms in a greater size -
Amedeo Avogadro
He stated the relationship between the masses was the same volume of gases. -
JJ Thompson
He thought that atoms were made of small particles -
Electron cloud model
It locates electrons in the atom -
Plum Pudding model
It reveals the nucleus in the atom -
Dmitri Mendeleev
He created the periodic table -
Albert Einstein
He theorized that the atom could be split and was proven by Oppenheimer -
Niels Bohr
He had the idea that an atom is a small positively charged nucleus -
Robert Millikan
He discovered the value of the electric charge in a electron -
Werner Heisenberg
He formulated quantum mechanics in terms of matrices -
Pierre and Marie Curie
Both found radioactivity in many elements -
Erwin Shrodinger
He found the wave equation for electron movements -
James Chadwick
He found neutrons inside the atoms