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The only one on the list that I know is radioactive is Carbon-14. 

Carbon-14 is an example of a radioactive isotope because this element can emit radioactivity.

What is Radioactivity?

Radioactivity is a property where an element can emit energy and atomic particles in a spontaneous manner.

What is isotope?

Isotopes are two or more types of atoms that have the same atomic number and position in the periodic table, and that differ in nucleon numbers due to different numbers of neutrons in their nuclei.

To learn more about radioactivity here

https://brainly.com/question/1770619

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