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Matter (Theories (Ernest Rutherford (Gold Foil experiment, determined the…
Matter
Theories
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John Dalton
Elements consist of tiny particles, every atom of the same element are identical, compounds have constant composition because they contain a fixed ratio of atoms
JJ Thomson
Discovered Electrons, Cathode Ray Tube experiment
Ernest Rutherford
Gold Foil experiment, determined the presence of a nucleus in an atom
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Periodicity
Dimitri Mendeleev
Arranged first periodic table based on similar properties in the same row. Left some elements blank but made very accurate guesses at to what they might be
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Todays periodic table
Modern periodic table is arranged in order of increasing atomic number. Families (Colums) Groups (Rows)
Atomic Radius
A chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding shells of electrons.
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Composition
Atoms
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Positive charged, 1 AMU, located in nucleus
Electrons
Negative charge, 1/1837 AMU, located in electron cloud
Neutrons
No charge, 1 AMU, located in nucleus
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