We just learned how Molecules are a bunch of atoms stuck together.
Another fun thing to learn about is Chemical Elements.
These are the very simple types of atoms that make up all of the molecules that make up everything in the world.
So for example, Oxygen is a chemical element, and so is Hydrogen.
They're both types of gases,
and they both are atoms all by themselves.
But when these atoms get stuck together, they become a molecule and turn into water!
Every type of thing on the planet is made up of these chemical elements,
from the dirt under your feet to the clouds in the sky.
(from: wikipedia - chemical element)
