Pico (unit symbol p) is a unit prefix in the metric system denoting a factor of one trillionth in the short scale and one billionth in the long scale (0.000000000001); that is, 10−12.
Derived from the Spanish word pico, (peak, beak, little bit), pico is one of the original twelve prefixes defined in 1960 when the International System of Units (SI) was established.
Atomic radii range from 28 picometers (pm) for helium to 260 pm for caesium. One picolight-year (ply) is about nine kilometers (six miles).
Carbon atom has radius of 77 picometers.
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