What is the heaviest element that has only one isotope and is not radioactive?
The element with only one isotope is called a Mononuclidic element. The monoisotopic element is generally stable where their half-life is so long that it is still not observed. Finding out the heaviest Mononuclidic element will answer the question above.
Answer and Explanation:
Gold is the heaviest and most stable non-radioactive monoisotopic element. It has one isotope Gold-197 which is nonradioactive and stable.
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Learn more about this topic:
from Chemistry 101: General ChemistryChapter 3 / Lesson 1