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by Anonymous on April 18th, 2007
yocto- (symbol y) is a SI prefix in the SI system of units denoting a factor of 10−24 or 0.000000000000000000000001.
Adopted in 1991, it comes from the Greek οκτώ, meaning eight, because it is equal to 1/10008.
It is used for measuring an atom's length, radius, and weight. E.G.
Mass of electron: 0.000 911 yg
Mass of proton: 1.672 60 yg
Mass of neutron: 1.674 90 yg
1000−8
10^−24
yocto
Symbol: y
Septillionth Quadrillionth
0.000 000 000 000 000 000 000 001
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