2.3 Isotopes
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17. Define "isotopes."
Different atoms of the same element that have the same number of protons but different numbers of neutrons.
18. Why do isotopes of the same element have the same chemical properties?
Because they have the same number of electrons and therefore the same electronic configuration.
19. How is the relative atomic mass of an element calculated?
It is calculated from the relative masses and the percentage abundances of all its isotopes.