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10 cards from this deck
Same element, same protons, different neutrons
Same (same number of protons)
Different (different number of neutrons)
Same number of electrons
Number of protons
E-A (element-mass number)
% of each isotope in nature
Cl-35: 75%, Cl-37: 25%
Weighted average using isotope masses and abundances
35.5 u
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