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C1 REVISION (Atoms (Electron : relative mass of 0 or 1/2000 and charge of …
C1 REVISION
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Elements
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Relative atomic mass = sum of(isotope abundance X isotope mass number) divided by sum of abundances of all the isotopes
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The history of the atom
In 1909 Rutherford and Marsden dis-proved the plum pudding model by firing positively charged alpha particals at gold foil and 99% passed straight through proving 99% of the atom is empty space but some reflected straight back and some fired back at an angle which proves that there is a positive nucleus
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In 1897 JJ Thompson proved that atoms were not solid spheres and came up with the plum pudding model
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