You probably already know that everything is made up of little tiny things called atoms. You might even know that each atom is made up of even smaller particles called protons, neutrons and electrons. And you've probably heard that atoms are small. But I bet you haven't ever thought about how small atoms really are. Well, the answer is that they are really, really, really small.
Just how small are atoms?
What are atoms made of?
How big is the Nucleus?
So how big is the nucleus? So if you popped open the blueberry and were searching for the nucleus, it would be invisible. It's too small to see. So to actually see the nucleus, we need to blow up the blueberry, up to the size of a football stadium.