AQA Chemistry (2013) Unit 3

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  • Created on: 15-05-13 12:23

3.1.1 The Early Periodic Table

·         John Dalton, 1800

o   Elements arranged in order of mass

·         John Newlands, 1864

o   Law of Octaves

o   Known elements arranged in order of mass

o   Every eighth element similar

o   Assumed all elements had been found

o   Ridiculed

·         Dmitri Mendeleev, 1869

o   Known elements arranged in order of atomic weights

o   Periodic pattern in properties

o   Left gaps for undiscovered elements

o   Could predict what properties new elements would have

3.1.2 The Modern Periodic Table

·         Not all elements fitted the pattern of atomic weights (e.g. argon)

·         Elements

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