in neutral atom: atomic number = # protons = # electrons
Atomic mass = # protons + # neutrons
One way in which Earths evolution as a planet can be understood is by measuring the amounts of certain isotopes in rocks. One quantity recently measured is the ratio of 129Xe to 130Xe in some minerals.
In what way do these two isotopes differ from one another?
a. number of electrons
b. number of protons
c. number of neutrons
d. mass number
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