Samarium (Sm) has 7 naturally occurring isotopes (3 are radioactive).
Remind them that geologists only use certain radioactive isotopes to date rocks.
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However, oxygen atoms can have between 8 and 10 neutrons in the nucleus and therefore the isotopes of oxygen have atomic masses of 16, 17, and 18 a.m.u.(and none are radioactive!
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The only way that this can happen is by changing the number of protons in the nucleus (an element is defined by its number of protons).
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