What is the heaviest element that has only one isotope and is not radioactive?

Question:

What is the heaviest element that has only one isotope and is not radioactive?

Mononuclidic Element


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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The Periodic Table: Properties of Groups and Periods

from Chemistry 101: General Chemistry

Chapter 3 / Lesson 1
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