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OpenStudy (anonymous):
CAN SOMONE HELP WITH THESE QUESTIONS 9.Francium has 36 isotopes, but only francium-223 occurs in nature. Francium-223 spontaneously emits particles and energy, so francium-223 is a(an) of francium
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OpenStudy (anonymous):
isotope
OpenStudy (anonymous):
Naturally occurring radioactive isotope.
OpenStudy (jtfan2000):
agreed - isotope
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