Problem: Chlorine has 2 naturally occurring isotopes, Cl-35 and Cl-37.  Which is generally true?  a)  Cl-35 has the greater abundance. b)  The relative abundances are the same. c)  The relative abundances are never known. d)  Cl-37 has the greater abundance. e)  There has to be a third naturally occurring isotope. 

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Chlorine has 2 naturally occurring isotopes, Cl-35 and Cl-37.  Which is generally true? 

a)  Cl-35 has the greater abundance.

b)  The relative abundances are the same.

c)  The relative abundances are never known.

d)  Cl-37 has the greater abundance.

e)  There has to be a third naturally occurring isotope. 

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