When we say that radioactivity is nature's "philosopher's stone," we mean that
A) radioactivity was discovered by Plato.
B) the number of neutrons in a radioactive nucleus can change.
C) radioactivity can change one element into another by changing the number of protons in a nucleus.
D) electron spin varies in a radioactive atom.
E) any atom that undergoes radioactive decay eventually becomes an atom of lead.

Question

Quizplus · Accepted Answer

The phrase "philosopher's stone" refers to the mythical substance that was believed to be able to transform base metals into gold. In a similar way, radioactivity can transform one element into another by changing the number of protons in a nucleus through alpha decay, beta decay, or gamma decay. Therefore, choice C is the best answer. Options A, D, and E are incorrect because they are either irrelevant or false. Option B is partially correct, but it does not fully capture the meaning of the phrase "philosopher's stone."

When We Say That Radioactivity Is Nature's "Philosopher's Stone," We