Which radioactive isotopes were discovered by Marie and Pierre Curie?

• A. Carbon-14 and Tritium
• B. Polonium-210 and Radium-226
• C. Plutonium-239 and Americium-241
• D. Uranium-238 and Thorium-232

Answer: (B)

Verified step by step guidance

1. Understand that the question is about the discovery of specific radioactive isotopes by Marie and Pierre Curie, who were pioneering scientists in the field of radioactivity.
2. Recall that Marie and Pierre Curie discovered new elements that exhibited radioactivity, rather than isotopes of already known elements.
3. Identify that the elements discovered by the Curies were Polonium and Radium, which are radioactive elements, not isotopes like Carbon-14 or Uranium-238.
4. Recognize that Polonium-210 and Radium-226 are specific isotopes of the elements Polonium and Radium, respectively, which are associated with their discovery.
5. Conclude that the correct answer involves Polonium-210 and Radium-226, as these isotopes represent the radioactive elements discovered by Marie and Pierre Curie.