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460 BCE
Democitus
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/ -
John Dalton
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/ -
Dmitri Mendeleev
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 -
Eugene Goldstiene
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/ -
.J.J Thomson
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 -
Max Planck
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 -
Robert Millikan
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 -
Ernest Rutherford
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 -
Neils Bohr
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/ -
Erwin Schrodinger
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 -
James Chadwick
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 -
Werner Heisenberg
His is most famously known for his theory of quantum mechanics. He also was helping with making nukes and the Atomic bombs.
