U-235, the isotope of uranium commonly used in nuclear power plants, is
A)the most common of the naturally occurring isotopes of uranium.
B)heavier than the other well-known isotope of uranium.
C)rare even in uranium-rich deposits and must be enriched to use as fuel.
D)only found in quartz veins in granite plutons.

Question

Quizplus · Accepted Answer

U-235 is a rare isotope and makes up only about 0.7% of naturally occurring uranium. In order to use U-235 as fuel in nuclear power plants, it must be enriched to increase its concentration.

U-235, the Isotope of Uranium Commonly Used in Nuclear Power