Atoms:
* The fundamental building blocks of matter. They are the smallest unit of an element that retains the chemical properties of that element.
* Consist of a nucleus containing protons and neutrons, surrounded by electrons.
* Examples: Hydrogen (H), Oxygen (O), Carbon (C), Helium (He)
Molecules:
* Two or more atoms held together by chemical bonds.
* Can be composed of the same type of atom (diatomic molecules) or different types of atoms (compound molecules).
* Have different properties than the individual atoms they are made of.
* Examples: Water (H₂O), Carbon dioxide (CO₂), Oxygen (O₂), Glucose (C₆H₁₂O₆)
Here's a simple analogy:
Think of Lego bricks as atoms. You can build many different structures (molecules) by combining different Lego bricks in different ways. Each structure will have its own unique properties based on how the bricks are put together.
Key Differences in a Table:
| Feature | Atom | Molecule |
|-------------|--------------------------|---------------------------|
| Definition | Smallest unit of an element | Two or more atoms bonded |
| Composition | Protons, neutrons, electrons | Atoms held by chemical bonds |
| Examples | Hydrogen (H), Oxygen (O) | Water (H₂O), Carbon dioxide (CO₂) |
In essence: An atom is the basic unit, while a molecule is a combination of atoms.
