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He believed that you could only split matter in half a certain amount of times and eventually you would get to what he called an atom. This he claimed was the smallest thing in the world and could not be split in half.
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He was the first to recognized the existence of atoms and elements and gave atomic weigh to some of them. He also proposed atomic theory in 1803
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Created by John Dalton, Illustrated an atom as a solid sphere of mass.
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He discovered radioactivity that allowed later scientist to perfect the atomic model and worked with magnetism of atoms.
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He discovered the existence of the electron and created the plum pudding model where the atom was positive and had negative charges wondering around.
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He developed quantum theory and stated that energy is given off in little packets
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Created by JJ Thomson, it suggested atoms were made up of positive and negative charges and that the negative electrons were a lot smaller than positive protons, like plum pudding.
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He discovered the theory of relativity and that light was made of different particles.
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He developed an electrical device the clicked when it hit alpha particles named the Geiger counter.
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He did the oil drop experiment discovering a way to determine the mass and unit of charge of the electron.
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Created a nuclear model after his gold foil experiment his model had a positive charged middle and negatively charged electrons around the protons as well as a lot of empty space.
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Created by Rutherford, it shows that the atom is mostly made up of empty space.
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Used X-rays to find frequency of elements and determined the number of protons correlates with the atomic number.
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Decided to make a new model, he created energy levels in atoms and only a certain amount of electrons could be on each level.
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Created by Neils Bohr, it illustrated the negatively charged electrons orbiting the positively charged nucleus like the planets.
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Created by Erwin Schrotinger, His model illustrated the electrons orbiting the nucleus in a cloud.
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He built off of Bohr's atomic model and believed it was unlikely that an electron would stay in one position.
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Chadwick discovered the existence of the neutron.
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“Atomic Structure Timeline.” Homepage, atomictimeline.net/. Brown, Theodore L., and Michael W. Lufaso. Chemistry: the Central Science. Pearson, 2019. Johnson, Rebecca L. Atomic Structure. Twenty-First Century Books, 2008. Models Of The Atom. www.siyavula.com/read/science/grade-10/the-atom/04-the-atom-02.
