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15 cards from this deck
1897
Ball of positive charge with negative electrons embedded
Gold foil (a few atoms thick)
Positive
Most alpha particles passed straight through
Empty space
Centre of atom has positive charge
Centre contains a great deal of mass (nucleus)
Electrons orbit nucleus at specific distances
Energy levels or shells
James Chadwick
Number of electrons equals number of protons
0.10.10.1 nm (1×10−101 \times 10^{-10}1×10−10 m)
1×10−141 \times 10^{-14}1×10−14 m
+1, 0, -1
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