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460 BCE
Democritus
Greek philosopher who was born in 460 B.C and died in 370 B.C and was one of the first creators of the atomic theory -
442 BCE
Democritus- "Atomo"
Democritus proposed that matter is made out of space and small particles, which are invisible, indestructible and cannot be changed. His atomic idea said that every atom was different in shape, size, mass and position, and also that atoms are infinite. https://www.youtube.com/watch?v=VYxRss5IQTk -
John Dalton
English chemist and physicist born in 1766 and died in 1844 -
John Dalton
Dalton's was the first scientist to create an atomic theory. He continued with Democritus idea of all matter made out of small particles called atoms. Also he proposed that materials that are made the same type of atoms are called elements, compounds (which are made of numerous elements) have different atoms, and that chemical reactions do not modify the atom at all, what actually happens is that the atoms will rearrange. https://youtu.be/syi3pXJNe58 -
Joseph John Thomson
Physicist who was born on December 1856 and died 1940 and first scientist to provide a model -
Joseph John Thomson- "Plum- Pudding"
JJ. Thomson, through his Cathode Ray time experiment, was the scientist who discovered one of the most important particles in the structure of the atom, the electrons. With this, he concluded that atoms do have a charge, it has a negative particle, which are distributed in the whole atom and electrons are embedded in a positive charge. Based on that, he developed his atomic model called the Plum- Pudding model. Cathode Ray: https://youtu.be/O9Goyscbazk
Plum-Pudding: https://youtu.be/8pBElOzwtFc -
Max Planck- "Quantum Theory"
Even though Planck did not study exactly the atom, he did an important contribution to the development and understanding of the atom. He was the creator of the Quantum theory of energy, which consisted on energy being radiated in specific amounts instead ofcyntinous waves. With this, he was able to explain colors being related to heat. His experiment was useful to the atomic understanding because it presented how was the behavior, the vibration of this particles. https://youtu.be/DYakbINx53c -
Max Plank
Max Planck, a German physicist who was born in 1858 and died in 1947. -
Albert Einstein
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Albert Einstein
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Robert Millikan
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Robert Millikan
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Ernest Rutherford
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Ernest Rutherford
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Neils Bohr
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Neils Bohr
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Erwin Shrödinger
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Erwin Schrödinger
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James Chadwick
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Charles Chadwick
