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QUESTION

# What is system international unit of atomic radius ?

As far as I know, the picometer is currently being used as the SI unit for atomic radii.

A picometer is equal to 10^(-12)"m".

The more traditional unit used was the angstrom, for which you have

"1 angstrom" = 10^(-10)"m"

Keep in mind, however, that angstroms are not SI units.

You'll sometimes see atomic radii expressed in nanometers, for which

"1 nm" = 10^(-9)"m"

However, nanometers are not used as often as picometers for atomic radii.