-
Democritus
Democritus posted the Atomic Theory. He posted that all matter is made up of small indestructible units he called atoms. https://courses.lumenlearning.com/boundless-chemistry/chapter/history-of-atomic-structure/ -
Period: to
Atomic Understanding
-
Isaac Newton - a mechanical universe
Isaac Newton theorized a mechanical universe with small, solid masses in motion. https://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm
https://courses.lumenlearning.com/boundless-chemistry/chapter/history-of-atomic-structure/ -
Dalton's Theory
John Dalton proposed that elements consisted of atoms that were identical and had the same mass and that compounds were atoms from different elements contained together. https://www.timetoast.com/timelines/important-figures-events-in-the-history-of-atomic-structure -
The Periodic Table
In 1869 Dimitri Merdeleeu created the periodic table. It is a tabular display of the chemical elements which are arranged by atomic number, electron configuration, and recurring chemical properties. https://removeandreplace.com/2015/09/09/periodic-table-of-elements-with-names-and-symbols/
https://en.wikipedia.org/wiki/Periodic_table -
The discovery of x-rays
In 1895 Wilhelm Roentgen discovered x-rays. His first x-ray was of his wife's hand. https://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm
https://www.dailymail.co.uk/news/article-6491287/Roentgens-human-X-ray-wifes-hand-1895.html -
The Plum Pudding Model
J.J. Thomas determined the charge to mass ratio of electrons. He found that an atom consists of a positive and negative charge, that an atom is electrically neutral, and that negatively charged electrons are fixed in a positive sphere. https://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm
https://medium.com/@lntlink.edu/a-timeline-of-atomic-models-cb2607b1da85 -
The Saturian Model
Hantaro Nagaoka proposed an atomic model called the Saturian model describe the structure of an atom. https://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm
https://nuclear-power.com/wp-content/uploads/Faulure-of-classical-Physics-Atomic-Nucleus.png -
Special theory of relativity
Albert Einstein created the special theory of relativity. He laid the basis for the release of atomic energy. https://www.timetoast.com/timelines/important-figures-events-in-the-history-of-atomic-structure -
The Rutherford Model
The model described the atom as a tiny dense positively charged core called a nucleus, in which all the mass is concentrated, around which the light called electrons, circulate at some distance, much like planets revolving around the sun.
google.com/search?q=ernest+rutherford+nuclear+model&rlz=1CAHKDC_en944&oq=ernest+rutherford+nuclear+model&aqs=chrome.69i57j0i512j0i22i30j0i39
https://en.m.wikipedia.org/wiki/Rutherford_model#/media/File%3ARutherford_atomic_planetary-model.svg -
The Bohr Model
Niels Bohr created the Bohr model - it shows electrons in orbits spinning around the nucleus. https://medium.com/@lntlink.edu/a-timeline-of-atomic-models-cb2607b1da85
https://courses.lumenlearning.com/boundless-chemistry/chapter/history-of-atomic-structure/ -
The Atomic Number
H.G.J. Moseley discovered that the number of protons in an element determines its atomic number. https://www.barcodesinc.com/articles/timeline-on-atomic-structure.htm
https://media.springernature.com/original/springer-static/image/prt%3A978-3-319-39312-4%2F1/MediaObjects/978-3-319-39312-4_1_Part_Fig1-244_HTML.png -
The Quantum Theory
Max Planck was an originator of the Quantum Theory. He contributed to the understanding of atomic and subatomic processies. https://www.timetoast.com/timelines/important-figures-events-in-the-history-of-atomic-structure -
Ernest Rutherford
Ernest Rutherford claimed that all of the positive charge and all of the mass of the atom and that most of the volume of the atom was empty space occupied by the electrons.(protons as well) https://www.timetoast.com/timelines/important-figures-events-in-the-history-of-atomic-structure -
The Atomic Structure Theory
Niels Bohr proposed an atomic structure theory that stated the outer orbit of an atom could hold more electrons than the inner orbit. https://wwwbarcodesinc.com/articles/timeline-on-atomic-structure.htm
https://atomictheoryfinal.weebly.com/niels-bohr.html -
The inclusion of Quantum Mechanics
Werner Heisenerg contributed to the atomic theory by including quantum mechanics, used for interpreting the behavior of elementary particles and atoms. https://www.timetoast.com/timelines/important-figures-events-in-the-history-of-atomic-structure -
The Quantum Mechanical Model
Erwin Schrodinger made the Quantum Mechanical model- he theorized the the electrons didn't spin in orbit, but they buzzed around the atoms sketching out the space. https://medium.com/@lntlink.edu/a-timeline-of-atomic-models-cb2607b1da85 -
Schrodinger's Equation
Schrodinger combined the equations for the behavior of waves with the de Broglie equation to generate a model for the distribution of electrons.This equation could be used to solve and give an accurate description of he energy of an electron in an atom, when these electrons are treated as waves.
breakingatom.com/learn-the-periodic-table/the-history-of-the-atomic-model-schrodinger-and-the-wave-equation
https://www.timetoast.com/timelines/important-figures-events-in-the-history-of-atomic-structure -
The discover of Neutrons
James Chadwick discovered neutrons, particles whose mass was close to that of a proton. https://www.timetoast.com/timelines/important-figures-events-in-the-history-of-atomic-structure
