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10 cards from this deck
Special unit to compare masses of different atoms
Exactly 12.0 u
1.67×10−271.67 \times 10^{-27}1.67×10−27 kg
Alpha particles (positively charged)
Most alpha particles passed straight through
Positively charged
Very small, atom mostly empty space
In the nucleus
Size of a pea
Average mass of element's naturally occurring isotopes
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