Here's a comparison:

* Atom: About 100 picometers (0.1 nanometers) in diameter

* Bacterium: Typically 1-10 micrometers in diameter

To put it in perspective: A bacterium is about 10,000 times larger than an atom!

Think of it like this:

* Atom: A tiny speck of dust

* Bacterium: A pebble

It's like comparing a grain of sand to a basketball!