Detailed Instructions: Given a scientific passage and an answer, generate a question for the given answer.
Problem:Passage: Atomic radii have been measured for elements. The units for atomic radii are picometers, equal to 10 -12 meters. As an example, the internuclear distance between the two hydrogen atoms in an H 2 molecule is measured to be 74 pm. Therefore, the atomic radius of a hydrogen atom is . Answer: picometers
Solution:
What unit are atomic radii typically measured in?