the.com/picometer
A trillionth of a meter, where atoms start looking suspiciously roomy.
means A unit of length equal to one trillionth of a meter, used to measure atoms and chemical bonds.
from From the SI prefix pico-, borrowed from Spanish and Italian pico ('a little bit, beak'), stacked onto meter.
Atom scaleHydrogen atoms span roughly 100 picometers across.
Old nameOnce called the stigma or bicron before standardization.
Bond rulerChemists measure bond lengths in picometers daily.