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History of the Atom
Democritus ,[object Object],[object Object]
Dalton’s Atomic Theory (1807) ,[object Object],[object Object],[object Object]
Dalton’s Atomic Theory (cont.) ,[object Object]
Dalton’s Atomic Theory (cont.) ,[object Object]
Some of Dalton’s Symbols for the Elements
Sir William Crookes (1879) ,[object Object]
Figure 3.7 :  Schematic of a cathode ray tube
John Joseph (JJ) Thomson (1903) ,[object Object],[object Object],[object Object]
Ernest Rutherford (1909) ,[object Object],[object Object]
Figure 3.5 :  Rutherford’s experiment
Figure 3.6:   Results of foil experiment if Plum Pudding model had been correct
Figure 3.6 :  Actual Results.
Figure 3.9 :  A nuclear atom viewed in cross section
Niels Bohr (1913) ,[object Object],[object Object]
James Chadwick (1932) ,[object Object],[object Object],[object Object]
Figure 3.10 :  Two isotopes of sodium. Mass number ( A ) = protons + neutrons Atomic Number ( Z ) = protons A Z  X
An Ion of Sodium

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