In some cases, the most abundant isotope of an element can be established by rounding off the atomic mass to the nearest whole number, as in 39 K, 85 Rb, and 88 Sr But in other cases, the isotope corresponding to the rounded off atomic mass does not even occur naturally, as in 64 Cu Explain the bas...

In some cases, the most abundant isotope of an element can be established by rounding off the

Question:

In some cases, the most abundant isotope of an element can be established by rounding off the atomic mass to the nearest whole number, as in ³⁹K, ⁸⁵Rb, and ⁸⁸Sr. But in other cases, the isotope corresponding to the rounded-off atomic mass does not even occur naturally, as in ⁶⁴Cu. Explain the basis of this observation.

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