Which of the following statements is/are CORRECT?
1)Naturally occurring isotopes account for only a small fraction of known radioactive isotopes.
2)A few radioactive isotopes with long half-lives,such as U-235 and U-238,are found in nature.
3)Trace quantities of some short-lived radioactive isotopes,such as C-14,are found in nature because they are formed continuously by nuclear reactions.

Question

Quizplus · Accepted Answer

Statement 1 is incorrect as naturally occurring isotopes account for the majority of known radioactive isotopes. 
Statement 2 is correct as U-235 and U-238 are examples of naturally occurring isotopes with long half-lives. 
Statement 3 is incorrect as short-lived radioactive isotopes, like C-14, are not continuously formed by nuclear reactions and are therefore not found in significant quantities in nature.

Which of the Following Statements Is/are CORRECT