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Word Count: 877
In the beginning of the 1800s John Dalton an English scientist did work some work on gases which lead him to the creation of a complex system of symbols for all known elements at the time He took all the information he had collected along with the Laws of Conservation of Mass Definite Composition and Multiple Proportions and updated Aristotles theory of matter with the Atomic Theory of Matter which stated - All matter is composed of tiny indivisible particles called atoms - Atoms of an element have identical properties - Atoms of different elements have different properties - Atoms of two or more elements can combine in constant ratios to form new substances In the late 1800s a man named J J Thomson did some experiments whos results did not agree with Daltons Atomic Theory Thomson passed electricity though gases my his experiments he theorized the existence negatively charged subatomic particles he called electrons From this theory Thomson created a model of a atom which had the electrons placed evenly inside the atoms In the early 1900s a Japanese scientist named H Nagaoka designed an atom model as a large sphere surrounded by a ring of negatively charged electrons Also during the early 1900s 1898-1907 a physicist named Ernest Rutherford worked on experiments to test current
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