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atom with a specific number of neutrons (and different mass numbers) - written: C-12 (symbol-weight) or ¹²C (^mass symbol)- the most common isotope of an element appears on the periodic table- atomic weight = average of all naturally occurring isotopes

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1.
atom with a specific number of neutrons (and different mass numbers)
- written: C-12 (symbol-weight) or ¹²C (^mass symbol)
- the most common isotope of an element appears on the periodic table
- atomic weight = average of all naturally occurring isotopes





 
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