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Chemistry, 27.09.2019 12:10 kavron2322
The atomic mass of element a is 63.6 atomic mass units. the only naturally occurring isotopes of element a are a-63 and a-65. the percent abundances in a naturally occurring sample of element a are closest to
a) 31% a-63 and 69% -65
b) 69%a-63 and 31% a-65
c) 50% a-63 and 50% a-65
d) 100% a-63 and 0% a-65
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