atomic number 85

The element with atomic number 85 is called astatine, and it is extremely rare.

原子序数为85的元素被称为砹，它非常稀有。

During the chemistry lecture, the professor explained that atomic number 85 belongs to the halogen family.

在化学课上，教授解释说原子序数为85的元素属于卤族元素。

Scientists have difficulty studying atomic number 85 because it decays very quickly.

科学家们很难研究原子序数为85的元素，因为它衰变得非常快。