Classify atoms, molecules, elements, and compounds worksheet ... - Free Printable

To classify the particle diagrams, we need to determine whether each represents an element, a compound, or a mixture. Let's analyze each diagram one by one based on the arrangement and types of particles.

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🔹 Definitions:

- Element: Made of only one type of atom (same atoms).
- Compound: Made of two or more different types of atoms chemically bonded in a fixed ratio.
- Mixture: Two or more substances (elements or compounds) physically combined, not chemically bonded; they retain their individual properties.

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🔍 Analysis of Each Diagram:

#### 1)
- Shows molecules made of black, red, and white spheres.
- Each molecule has one black, two red, and one white atoms → consistent pattern.
- All molecules are identical and chemically bonded.
- This is a compound (specifically, likely water-like H₂O structure, but with different colors).

✔ Classification: Compound

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#### 2)
- A regular, tightly packed array of identical yellow spheres.
- All particles are the same → single type of atom.
- Arranged in a solid lattice → indicates a solid element.

✔ Classification: Element

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#### 3)
- Several identical red spheres scattered randomly.
- No bonding shown; particles are far apart.
- Represents individual atoms of the same type, in a gaseous state.

✔ Classification: Element (gaseous form)

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#### 4)
- Shows pairs of green and yellow atoms bonded together.
- Each molecule consists of one green and one yellow atom.
- All molecules are identical → same chemical formula.
- These are diatomic molecules of two different elements chemically bonded.

✔ Classification: Compound

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#### 5)
- A single molecule made of two red spheres and two small gray/white spheres.
- The red spheres are connected, and each has a small sphere attached → could be like O₂ with something else, but it's one molecule.
- But this appears to be one molecule composed of different atoms (red and gray), so it’s a compound.

Wait — actually, looking closely:
- Two large red spheres (likely oxygen) and two small gray spheres (possibly hydrogen), arranged as if forming a molecule like H₂O₂ (hydrogen peroxide), but it's one molecule.

But since it's only one molecule, it still represents a compound.

✔ Classification: Compound

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#### 6)
- A single blue sphere.
- Only one particle shown, no bonding.
- It’s just one atom.

✔ Classification: Element (single atom)

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#### 7)
- Shows multiple blue and white spheres grouped into identical molecules.
- Each molecule has one blue and two white atoms → like water (H₂O).
- All molecules are the same → chemically bonded in fixed ratio.

✔ Classification: Compound

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#### 8)
- A crystalline lattice of alternating red and yellow spheres.
- They are arranged in a regular pattern, suggesting a compound (like NaCl).
- Different atoms bonded in a fixed ratio → ionic compound.

✔ Classification: Compound

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✔ Final Classification Summary:

| Diagram | Classification |
|--------|----------------|
| 1) | Compound |
| 2) | Element |
| 3) | Element |
| 4) | Compound |
| 5) | Compound |
| 6) | Element |
| 7) | Compound |
| 8) | Compound |

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📌 Additional Notes:

- Elements: Diagrams where only one type of atom is present (2, 3, 6).
- Compounds: Where atoms of different types are chemically bonded in fixed ratios (1, 4, 5, 7, 8).
- No mixtures here — all diagrams show either pure substances (elements or compounds). None show unbonded combinations of different substances.

> ❗ Note: Although some diagrams (like 3 and 6) show single atoms, they are still classified as elements because they represent atoms of one kind.

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✔ Final Answer:

- Elements: 2, 3, 6
- Compounds: 1, 4, 5, 7, 8
- Mixtures: None

Let me know if you'd like a visual key or labels for each!