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Answer 1 · 2015-05-08T10:01:42

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

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

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

$1 angstrom = 10^{- 10} m$ $"1 angstrom" = 10^(-10)"m"$

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

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

$1 nm = 10^{- 9} m$ $"1 nm" = 10^(-9)"m"$

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