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10 cards from this deck
Smallest unit of matter retaining element properties
+1 charge, in nucleus
0 charge, in nucleus
-1 charge, 12000\frac{1}{2000}20001 mass
Number of protons in nucleus
Protons + neutrons in nucleus
Same element atoms with different neutron numbers
Helium nucleus, +2 charge
High-speed electron
Time for half the atoms in a sample to decay
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