1) The Nuclear Atomic Model - N3.pdf - Our search to...

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Our search to understand matter has been ajourney that dates back to Greekphilosophers over 2400 years agoDemocritus wondered if matter could bedivided into smaller and smaller piecesforever, or was a limited number of timesmatter could be divided?
Democritus theorized that matter could notbe divided smaller infinitely and that therewas the smallest piece of matter and it wouldbe invisible to the naked eyeHe called this matter “atomos” which means“not to be cut”
Democritus believed that atoms were small,hard particles that were all made of the samematerial but were different shapes and sizesHe also believed that atoms were infinite innumber, always moving and capable ofjoining together
Democritus’ thoughts were largely forgottenand ignored for 2000 yearsAt his time, Aristotle and Plato describedmatter as being part of four elements:EarthFireAirWater
Law of Definite Proportions:mass ratios ofelements in a compound are always thesame, therefore individual atoms of eachelement are all alikeLaw of Multiple Proportions:Atoms alwayscombine in whole number ratios (FeS orFeS2, never FeS1.5) indicating they can’t bebroken apart
Limitation:Could not explainwhyatoms ofelements combine in the ratio they doDespite this limitation, Dalton’swork became the foundation ofmodern chemistry

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