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Period: 100 to
atomic models
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400
The Alchemist 400bc
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400
Plato
Was a important part of the Timeline. He was a phylospher. He made up the theory of form. -
430
Democritis
He made up the atomic theory. Its not invisible but between atoms it lies space. -
Robert Boyle
He proposed that elements are basically composed of of various sorts and sizes capable of organising themselves into groups and that each group constitutes a chemical substance. -
Lavoisier
he invented the Law of Conservation of mass. In a chemical reaction mass cannot be destroyed nor created. -
John Dalton
He was a English Chemist. HIs theory was that atoms were invisible. Compounds are formed by joining or more elements.Became one of the foundations of modern chemistry. -
Dmitiri Mendeleev
He discovered the periodic table. He wrote 65 known elements on cards. Later on the periodic table was established in 1869. -
The Curies
Th curies discovered two elements. Those two elements are polonium and radium. -
J.J. Thomson
In 1897, English scientist provided the first hint that an atom is made of small particles. -
Albert Einstein
Albert's theory was of relativity. It was determined by the laws of physics. Also showed that the light within a vacuum is the same no matter the speed at which it travels. -
Ernest Rutherford
His discovred the atomic structure. in which the electrons were embedded in a positively charged atom like plums in a pu dding. -
Henry G. J. Mosley
He discovered the periodic table's true basics. -
Bohr Model
Neils Bohr introduced his model in 1913, that travel in a circular motion just like the solar system. The atoms travel around the nueclus -
Niels Bohr
His atomic model was apart of modern physics that showed protons and neutrons. On the outside was the electrons orbiting the neucleus.
