Question

which si unit of length is most commonly used to indicate the radius of an atom?
a 1 micrometer (μm)
b 1 millimeter (mm)
c 1 nanometer (nm)
d 1 picometer (pm)

Explanation:

The radius of an atom is on the order of \(10^{-10}\) meters. One nanometer (\(1\ nm = 10^{-9}\ m\)) is a commonly used unit for atomic - scale measurements.

Answer:

C. 1 nanometer (nm)