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He contributed by making the Atom theory which consists of five theories. Everything is composed of Atoms. Between Atoms there lies empty space. Atoms are indestructible. Atoms have always been in motion. The last one is there are in infinite amount of Atoms. Citation:https://www.universetoday.com/60058/democritus-atom/
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He made the first modern description of Atoms and developed the law of multiple proportions. He also believed the atomic theory could explain why water absorbed differnt gasses in different porpotions. He also believes that the Atoms are composed of everything in different ways
Citation:https://courses.lumenlearning.com/introchem/chapter/john-dalton-and-atomic-theory/ -
He has made the Periodic table and all of the elements with their Atoms. He also used this table to be able to predict new elements to add to it.
Citation: https://sites.google.com/site/theatomicstructure18611880/The--Atomic-Structure--1861-1880
https://period1dmitrimendeleev.weebly.com/contribution-to-atomic-theory.html -
He was the person that found out there were protons. He did a experiment with protons that could knock atoms and contract them to a positive electrode. Because of his work scientist could picture atoms even better.
Citations: https://prezi.com/evpfcux1jhvq/eugen-goldstein/ -
He noticed that the atom model didn't include negative or positive charged particles in it. So he made a more accurate model of the atom.
Citation: http://www.abcte.org/files/previews/chemistry/s1_p5.html -
He is the person that made the quantum theory to explain the reason for colors of hot glowing matter. He is also able to discover the energy of each quantum.
Citation:https://micro.magnet.fsu.edu/optics/timeline/people/planck.html -
He discovered the size of a electron by his oil drop experiment. He also determined what the smallest unit was or that it was quantized.
Citation: http://ffden-2.phys.uaf.edu/212_fall2003.web.dir/Ryan_McAllister/Slide3.htm -
He tested J.J Thomson's Oil Drop experiment and he got a different outcome. He found out the only way it would work if the mass was in the nucleus of the atom. So he made a planetary model of the Atom and put the particles in the nucleus.
Citation: http://www.iun.edu/~cpanhd/C101webnotes/modern-atomic-theory/rutherford-model.html -
He found the discoveries of the electron and radioactivity that led to different structures of the model. He proposed the theory of for hydrogen atom based on the quantum theory.
Citation: https://www.nobelprize.org/prizes/physics/1922/bohr/facts/ -
He made a new model of a atom. This model is patterned on the planetary system and known as the planetary model. He found out Electrons only circuit around the nucleus. Each orbit also has an energy associated with it.
Citation: http://www.abcte.org/files/previews/chemistry/s1_p6.html -
He is known for discovering the neutron. His discoveries lead to the discovery of the diffusion particle and the development of the Atomic bomb.
Citation: https://www.atomicheritage.org/profile/james-chadwick -
His is most famously known for his theory of quantum mechanics. He also was helping with making nukes and the Atomic bombs.
