Isotopes

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Isotope:

Atoms of the same element with different numbers of neutrons
Mass #:

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 #
- -e.g. Hydrogen-1
Another way to show an isotope:
- Chemical symbol with mass # on top, atomic # on bottom
- 10 11
- B B
- 5 5
Which isotope is most common?

Whichever whole number the mass # is closest to