Multiple choice

Radioactive disintegration of uranium ultimately results in the formation of

  1. radium

  2. thorium

  3. polonium

  4. lead

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Uranium-238 undergoes a series of radioactive decays (the uranium decay series) through multiple intermediate elements including radium, thorium, and polonium, ultimately stabilizing as lead-206. This decay chain is used in uranium-lead dating of very old rocks and minerals.