-
500 BCE
The Alchemists
The alchemists experimented with the at the time 4 elements. These findings contributed to the atomic theory. Alchemy and it's contributions to the atomic theory - Prezihttps://prezi.com › alchemy-and-its-contributions-to-the... Alchemy - chemistry - Encyclopedia Britannicahttps://www.britannica.com › science › Alchemy -
400 BCE
Democritus
Democritus Was a Greek philosopher and thought everything was made up a small particles. And that it changed the properties of matter. https://www.ccp5.ac.uk/sites/www.ccp5.ac.uk/files/Democritus/Basic/Atheory.html -
4 BCE
Platos solar system
Plato devoted a solar system that had the earth as the center. But it wasn’t accurate because the sun is. The solar system shows the planets https://users.astro.ufl.edu/~guzman/ast1002/class_notes/Ch1/Ch1.html -
4 BCE
Plato
Plato Was a philosopher that also thought Aristotle later. He thought that atoms were from five fundamental solids and that every thing on earth didn’t exist but was a “projection”. This helped develop atomic theory.
http://abyss.uoregon.edu/~js/glossary/plato.html
https://www.britannica.com/biography/Plato
https://study.com/academy/lesson/the-theory-of-forms-by-plato-definition-lesson-quiz.html -
Robert Boyle
Robert Boyle discovered a relationship with pressure and volume of gas. He published this in 1662. https://www.britannica.com/biography/Robert-Boyle -
Antone Lavoisier
Antone Lavoisier was a French chemist. He found that mass of something is always the same. This help develop the law of conservation of mass. https://www.nature.com/scitable/knowledge/library/the-conservation-of-mass-17395478/
http://chemed.chem.purdue.edu/genchem/history/lavoisier.html
https://www.breakingatom.com/learn-the-periodic-table/the-history-of-the-atomic-model-lavoiser-and-dalton -
John Dalton
John Dalton developed atomic theory. He argued that atoms varied in size and mass in different elements. He also propose the idea that chemical reactions change the arrangement of atoms. https://courses.lumenlearning.com/introchem/chapter/john-dalton-and-atomic-theory/
https://pubmed.ncbi.nlm.nih.gov/18175369/
https://www.britannica.com/biography/John-Dalton/Atomic-theory -
Billiard Ball Model
This model was made by Dolton. It called this because this because the small particles look like a ball pool. https://flexbooks.ck12.org/cbook/ck-12-middle-school-physical-science-flexbook-2.0/section/3.12/primary/lesson/daltons-atomic-theory-ms-ps/ -
Amedeo Avogadro
Amedeo Avogadro Thought that equal volume (gas) at the same temperature/pressure have the same amount of molecules. This law is named Avogadro”s law. https://www.sciencehistory.org/historical-profile/amedeo-avogadro -
Dmitri Mendeleev
Dimitri discovered/created the periodic table by putting them in order by atomic mass. This is so important because this is still used today and helps people identify elements. https://www.asbmb.org/asbmb-today/science/020721/a-brief-history-of-the-periodic-table
https://www.britannica.com/biography/Dmitri-Mendeleev -
JJ Thomson
JJ Thomson Discovered the electron thats negatively charged. This is super important because this contribute to the identification of an element. https://www.history.com/this-day-in-history/jj-thomson-announces-discovery-of-electrons
https://www.thoughtco.com/j-j-thomson-biography-607780 -
Plum pudding model
This model was made by JJ Thompson. It showed electrons surrounded with positively charged particles. Like mush https://www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/history-of-atomic-structure/a/discovery-of-the-electron-and-nucleus -
Pierre and Marie Curie
Pierre and Marie Curie Discovered two new elements and radioactivity, this was huge at the time. They got a Nobel prize for it. https://www.aps.org/publications/apsnews/200412/history.cfm -
Albert Einstein
Albert Einstein proved Adams exist by math. He also is known for his energy math equation E=MC^2. https://www.ans.org/news/article-969/albert-einstein-and-the-most-elemental-atomic-theory/
https://www.britannica.com/biography/Albert-Einstein -
Robert Millikan
Robert discovered the magnitude of an electron’s charge. He also won a noble prize for his findings. https://www.nobelprize.org/prizes/physics/1923/millikan/facts/ -
Ernest Rutherford
Ernest Rutherford Discovered that Adams have nucleuses. He also said that it was surrounded by a large empty space with small electrons. https://www.physicsoftheuniverse.com/scientists_rutherford.html
https://www.aps.org/publications/apsnews/200605/history.cfm -
Henry G J Mosley
Henry discovered a way to identify the elements by how many protons it had. This is a very big because we use it today on the periodic table.
https://www.famousscientists.org/henry-moseley/ -
Niels Bohr
Niels Bohr Won a Noble prize for his findings. He discovered atoms structure in the different parts of the atom. And proposed this idea. This was crucial in atomic theory. https://www.nobelprize.org/prizes/physics/1922/bohr/facts/ -
Erwin Schrodinger
Erwin Schrodinger calculated the energy levels of electrons in atoms. With his own formula called the Schrodinger equation. https://www.nobelprize.org/prizes/physics/1933/schrodinger/facts/ -
Electron Cloud Model
This model was made by Erwin. It showed a dense nucleus with a bunch of electrons around it. They have different orbits like a cloud because they go so fast. https://www.msnucleus.org/membership/html/jh/physical/atomictheory/lesson1/atomic1g.html -
Werner Heisenberg
Werner Heisenberg Developed/discovered a principle called the uncertainty that states you can’t know a particles momentum and position. He got a Nobel prize for his findings. https://www.aps.org/publications/apsnews/200802/physicshistory.cfm
https://www.britannica.com/biography/Werner-Heisenberg -
James Chadwick
James Chadwick discovered that neutrons exist and proved it. Neutrons have no positive or negative charge. https://www.nobelprize.org/prizes/physics/1935/chadwick/biographical/