 Anyways, let's try this one. It says the radius of a tin atom is 1.41 times 10 to the negative 8 centimeters. What is the radius of the tin atom in nanometers? So you're going to have to remember some conversion factors for this one. I like to go all the way back up to meter, so 1 nanometer is 1 times 10 to the negative 9 meters. And 100 centimeters is 1 meter. So we've got it in centimeters and we want to convert it to nanometers. So we can convert from centimeters to meters, right? And then from meters to nanometers. Everybody see that? So that's the way I like it. You can actually, if you knew the conversion between centimeters and nanometers in your head, you can do that too. Since we're introductory chemistry, let's just do it this way. 1 centimeter, 1 meter, and what happens? Cancel, cancel, right? So we're on meters now. We don't want meters, we want nanometers. So what are we going to do? 1 times 10 to the negative 9 meters is 1 nanometer. Cancel, cancel, like that, right? So what are we in now, units? A couple meters, right? So the radius of the 10 atom is going to be, let's try it together. So 1, 1.41 e negative 8, divide that number by 100, and then divide that number by 1e negative 9. We should get a more reasonable number, 0.141 nanometers. So the radius of atoms are kind of on that scale, the nanometer, actually angstrom scale, but are there any questions on this one? It's effectively a conversion factor, metric to metric conversions.