Yttrium Isotopes

**Definition:** Stable yttrium atoms that have the same atomic number as the element yttrium, but differ in atomic weight. Y-89 is the only naturally occurring stable isotope of yttrium.

**Tree numbers:** - D01.268.558.975.500 - D01.268.956.890.500 - D01.496.943 - D01.552.550.975.500