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Atoms of the same element with different numbers of neutrons
Mass of an individual isotope
Why is the mass of different isotopes different?
Number of neutrons is different
Atomic mass of an element:
Average mass of mixture of its isotopes
One way to show an isotope:
Name of element followed by mass #
Another way to show an isotope:
Chemical symbol with mass # on top, atomic # on bottom
Which isotope is most common?
Whichever whole number the mass # is closest to