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. What is the percent abundance in a naturally occurring sample of element A closest to?

Answer 1

The most abundant isotope is #""^63A#.

The average isotopic mass is the weighted average of the mass of the individual isotopes. Because the quoted average, #63.6# #"amu"#, is closer to #""^63A# than #""^65A#, the #""^63A# isotope is the more abundant. Can you tell us which metal this element is?

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Answer 2

Owen Ambrose

The percent abundance in a naturally occurring sample of element A is closest to 50% A-63 and 50% A-65.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.