Lesson 8 of 18
Atoms joined as one particle
Show on a big screenLook at one tiny piece of hydrogen gas. It is not one atom, the smallest particle of an element. It is two atoms, joined.
Step 1 of 3
- Hydrogen gas: two hydrogen atoms are joined.
- Oxygen gas: two oxygen atoms are joined.
- Water: two hydrogen atoms and one oxygen atom are joined.
A molecule is a group of atoms joined together as one particle.
The rule
A molecule is a group of atoms joined together. One kind of atom in a molecule means an element. Two or more kinds mean a compound.
| Molecule | Atoms in it | Kinds of atom | Belongs to |
|---|---|---|---|
| Hydrogen | 2 hydrogen | 1 | An element |
| Oxygen | 2 oxygen | 1 | An element |
| Water | 2 hydrogen, 1 oxygen | 2 | A compound |
Pick a substance. Slide the molecules. Match the goal.
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