PrepTest 91+, Section 2, Question 10
Radioactive elements may have been created when the universe began. However, even if this occurred, these elements are clearly still being created in the universe today. Radioactive elements are unstable, so most of them decay within at most a few million years into other, nonradioactive elements. So, if no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today, but there is an abundance of such elements.
Radioactive elements may have been created when the universe began. However, even if this occurred, these elements are clearly still being created in the universe today. Radioactive elements are unstable, so most of them decay within at most a few million years into other, nonradioactive elements. So, if no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today, but there is an abundance of such elements.
Radioactive elements may have been created when the universe began. However, even if this occurred, these elements are clearly still being created in the universe today. Radioactive elements are unstable, so most of them decay within at most a few million years into other, nonradioactive elements. So, if no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today, but there is an abundance of such elements.
Radioactive elements may have been created when the universe began. However, even if this occurred, these elements are clearly still being created in the universe today. Radioactive elements are unstable, so most of them decay within at most a few million years into other, nonradioactive elements. So, if no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today, but there is an abundance of such elements.
Which one of the following most accurately expresses the main conclusion of the argument?
Any radioactive elements created when the universe began have probably decayed into other, nonradioactive elements.
Radioactive elements are being created in the universe today.
If no new radioactive elements had been created after the universe began, almost no radioactive elements would be left in the universe today.
It is possible that radioactive elements were created when the universe began.
Due to their instability, most of the universe's radioactive elements decay within at most a few million years into other, nonradioactive elements.
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