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Yellow=Required

Purple=Extra Events

Blue=Biblography

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Democritus developed the atomic theory of the universe which states that indivisible and indestructible atoms are the basic components of all matter in the universe.

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Dalton's Atomic Theory and Atomic Model -1803-

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Dalton's Atomic Theory and Atomic Model -1803-

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Dalton's Atomic Theory: describes matter in the terms of atoms and their properties

Dalton's Atomic Model: Suggests that atoms are indivisible and indestructible particles.

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Darwin’s “On the Origin of Species” published -1859-

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Darwin’s “On the Origin of Species” published -1859-

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Novel published in which Darwin proposed that species evolve and that all living things can trace their descent to a common ancestor.

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Mendeleev realized that physical and chemical properties of elements are related to the atomic mass of the element. He then arranged them so that the elements with similar properties fell into vertical columns.

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Thompson’s CRT, Discovery of Electrons, and Atomic Model -1897-

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Thompson’s CRT, Discovery of Electrons, and Atomic Model -1897-

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Thompson's CRT(Cathode Ray Experiment):

Thomson had an inkling that the ‘rays’ emitted from the electron gun were inseparable from the latent charge, and decided to try and prove this by using a magnetic field.

Thompson's Discovery of Electrons:

The results of Thompson's CRT showed that all atoms contain tiny negatively charged subatomic particles (Electrons)

Thompson's Atomic Model:

Suggested that atoms are uniform spheres of positively charged matter in which electrons are embedded.

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Rutherford’s Gold Foil Experiment and Atomic Model -1911-

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Rutherford’s Gold Foil Experiment and Atomic Model -1911-

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Rutherford's Gold Foil Experiment:

In the experiment, a piece of gold foil was hit with alpha particles which have a positive charge. Revealed that gold atoms were mainly empty space.

Rutherford's Atomic Model:

Proposed that the atom has a small dense nucleus at its center, which contains protons.

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A British Luxury Passenger Liner that sank on April 15th, 1912. Over 1,500 people died and it is considered a famous tragedy in modern history.

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Moseley arranged the elements on the Periodic Table by the Atomic Mass of each element.

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Bohr's Atomic Model found that negatively charged subatomic particles (electrons) revolve around the nucleus in a circular path.

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Ernest Rutherford concluded that the atom's positive charge and its Atomic Mass were concentrated in the central nucleus Rutherford then identified the particles as protons.

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In 1926, Austrian physicist Erwin Schrodinger developed the concept of an electron cloud model which states that the could is consisted of a dense nucleus surrounded by a cloud of electrons at various levels in orbitals.

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In 1932, James Chadwick carried out several experiments to observe a subatomic particle (the neutron). His results confirmed that this was a neutral subatomic particle.

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Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei. It was discovered at the Kaiser Wilhelm Institute for Chemistry in December 1938. Otto Hahn and his colleague Fritz Straßmann discovered that fission products such as barium were also created in the process.

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First breaking of the Sound Barrier -1947-

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First breaking of the Sound Barrier -1947-

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Captain Chuck (U.S. Air Force) flew a rocket plane faster than the speed of sound. This took place at an altitude of 45,000 feet in California.

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On August 6, 1945 (during WW2) the US dropped an atomic bomb on the Japanese city of Hiroshima. THis was the first deployed nuclear weapon in history and over 140,000 people were killed.

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"Completion” of the Periodic Table -1951-

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"Completion” of the Periodic Table -1951-

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Glenn T. Seaborg discovered that the periodic table extends beyond Uranium (U). They created the current layout of the Periodic Table.

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Amy Laird-Carnegie Mellon. “The Periodic Table Is Finally Complete - Futurity.” Futurity, 8 Jan. 2016, www.futurity.org/periodic-table-new-elements-1087782-2/.

“Atomic Theory.” Www.msnucleus.org, www.msnucleus.org/membership/html/jh/physical/atomictheory/lesson1/atomic1g.html#:~:text=Austrian%20physicist%20Erwin%20Schr%C3%B6dinger%20(1887.

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Bhuyan, Satyam. “Dalton’s Atomic Theory: Definition, Statement, and Postulates.” Chemistry Learner, 12 Aug. 2023, www.chemistrylearner.com/daltons-atomic-theory.html.

Beca Bruder. “The Atomic Bombing of Hiroshima and Nagasaki & Just War Theory.” Medium, Medium, 5 Dec. 2017, medium.com/@bruder.melo/the-atomic-bombing-of-hiroshima-and-nagasaki-just-war-theory-bb59b1e5ec41.

Corrosion Doctors. “Mendeleev’s Periodic Table.” Corrosion-Doctors.org, 2019, corrosion-doctors.org/Periodic/Periodic-Mendeleev.htm.

“Darwin, Evolution, & Natural Selection (Article).” Khan Academy, www.khanacademy.org/science/ap-biology/natural-selection/natural-selection-ap/a/darwin-evolution-natural-selection#:~:text=In%20the%201850s%2C%20Darwin%20wrote.

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“Democritus: A Molecular Dynamics Simulation.” Www.ucl.ac.uk, www.ucl.ac.uk/~ucfbasc/Basic/Atheory.html#:~:text=About%20400%20B.C.%20the%20Greek.

“Discovery of Fission - Michael Liu - PH204, Fall 2009, Stanford University.” Large.stanford.edu, large.stanford.edu/courses/2009/ph204/liu1/.

‌Duignan, Brian. “Democritus | Biography & Facts.” Encyclopædia Britannica, 26 Feb. 2019, www.britannica.com/biography/Democritus.

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Editors, History com. “British Physicist J.J. Thomson Announces the Discovery of Electrons.” HISTORY, A&E Television Networks, 13 Nov. 2019, www.history.com/this-day-in-history/jj-thomson-announces-discovery-of-electrons.

https://www.facebook.com/Storiesbywilliams-205745679447998/?ref=hl. “Who Was Democritus? - Universe Today.” Universe Today, 27 July 2016, www.universetoday.com/60058/democritus-atom/.

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Khan Academy. “Dalton’s Atomic Theory.” Khan Academy, 2017, www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/history-of-atomic-structure/a/daltons-atomic-theory-version-2.

Khan Academy. “Discovery of the Electron and Nucleus.” Khan Academy, 2018, www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/history-of-atomic-structure/a/discovery-of-the-electron-and-nucleus.

Khan Academy. “Discovery of the Electron and Nucleus (Article).” Khan Academy, www.khanacademy.org/science/chemistry/electronic-structure-of-atoms/history-of-atomic-structure/a/discovery-of-the-electron-and-nucleus#:~:text=Summary.

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Lord Rutherford.” The History of the Atom, 2019, thehistoryoftheatom.weebly.com/lord-rutherford.html.

mlblevins. “Electron Cloud Theory Explained.” Science Struck, 29 Oct. 2010, sciencestruck.com/electron-cloud-theory#google_vignette. Accessed 25 Jan. 2024.

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“Moseley’s Periodic Table.” Corrosion-Doctors.org, 2019, corrosion-doctors.org/Periodic/Periodic-Moseley.htm.

“Nuclear Fission - Nuclear Museum.” Https://Ahf.nuclearmuseum.org/, ahf.nuclearmuseum.org/ahf/history/nuclear-fission/.

“Sinking of the Titanic.” Wikipedia, 24 Aug. 2020, en.wikipedia.org/wiki/Sinking_of_the_Titanic.

Shuttleworth, Martyn. “Cathode Ray Experiment by J. J. Thomson.” Explorable.com, 2019, explorable.com/cathode-ray-experiment.

“The Discovery of Nuclear Fission.” Www.mpic.de, www.mpic.de/4469988/die-entdeckung-der-kernspaltung#:~:text=Nuclear%20fission%20was%20discovered%20at.

The Editors of Encyclopaedia Britannica. “Bohr Model | Description & Development.” Encyclopædia Britannica, 23 Jan. 2020, www.britannica.com/science/Bohr-model.

The Editors of Encyclopaedia Britannica. “Rutherford Model | Definition & Facts.” Encyclopædia Britannica, 9 Nov. 2020, www.britannica.com/science/Rutherford-model.

Tikkanen, Amy. “Titanic | History, Sinking, Rescue, Survivors, & Facts.” Encyclopædia Britannica, 26 Oct. 2018, www.britannica.com/topic/Titanic.

“What Are Discovery of Protons and Neutrons? Definition, Types and Importance - Chemistry | AESL.” Www.aakash.ac.in, www.aakash.ac.in/important-concepts/chemistry/discovery-of-protons-and-neutrons.

Wikipedia Contributors. “On the Origin of Species.” Wikipedia, Wikimedia Foundation, 8 Dec. 2018, en.wikipedia.org/wiki/On_the_Origin_of_Species.

Wikipedia Contributors. “Sound Barrier.” Wikipedia, Wikimedia Foundation, 24 Aug. 2019, en.wikipedia.org/wiki/Sound_barrier.

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