# Expressing the Radius of an Atom in Nanometers

## Transcript

Hi, my name is Stefan. Today, I'm going to be speaking on how to express the atomic radius of an atom in nanometers. Now we know that nano equals 10 to the negative 9. Usually you would see atoms written in picometers. For example the atomic radius of oxygen, that equals 48 picometers and that's equivalent to 48 times 10 to the negative 12 meters. Now I could break this up and I can say 48 times 10 to the negative 3 times 10 to the negative 9 meters. And we know that 10 to the negative 9, that's a nano. So what we get is 48 times 10 to the negative 3, this nm, now we have the atomic radius of oxygen in nanometers.