Fill in the missing information in the table based on the provided molecular diagrams.

Let's solve the task step by step. The table asks us to fill in the chemical formula and determine whether each substance is an element or compound based on the given diagrams of molecules.

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Step 1: Understand the Diagrams

Each diagram shows atoms represented by colored circles:
- Different colors = different elements.
- Same color = same element.

We need to identify:
1. The chemical formula (using symbols like H, O, C, N, S, Cl).
2. Whether it's an element (only one type of atom) or a compound (two or more types of atoms).

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Now, go row by row:

#### 1. Water
- Diagram: One large red circle (Oxygen), two small white circles (Hydrogen)
- Atoms: 1 O, 2 H
- Chemical formula: H₂O
- Is it an element or compound? → Two different atoms → Compound

✔ Answer: H₂O, Compound

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#### 2. Nitrogen
- Diagram: Two blue circles (same color)
- Atoms: 2 N
- Chemical formula: N₂
- Only one type of atom → Element

✔ Answer: N₂, Element

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#### 3. Carbon dioxide
- Diagram: One black (Carbon), two red (Oxygen)
- Atoms: 1 C, 2 O
- Chemical formula: CO₂
- Two different atoms → Compound

✔ Answer: CO₂, Compound

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#### 4. Ammonia
- Diagram: One blue (Nitrogen), three white (Hydrogen)
- Atoms: 1 N, 3 H
- Chemical formula: NH₃
- Two different atoms → Compound

✔ Answer: NH₃, Compound

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#### 5. Sulphur dioxide
- Diagram: One yellow (Sulphur), two red (Oxygen)
- Atoms: 1 S, 2 O
- Chemical formula: SO₂
- Two different atoms → Compound

✔ Answer: SO₂, Compound

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#### 6. Hydrogen
- Diagram: Two white circles (Hydrogen)
- Atoms: 2 H
- Chemical formula: H₂
- Only one type of atom → Element

✔ Answer: H₂, Element

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#### 7. Hydrogen chloride
- Diagram: One green (Chlorine), one white (Hydrogen)
- Atoms: 1 H, 1 Cl
- Chemical formula: HCl
- Two different atoms → Compound

✔ Answer: HCl, Compound

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#### 8. Oxygen
- Diagram: Two red circles (Oxygen)
- Atoms: 2 O
- Chemical formula: O₂
- Only one type of atom → Element

✔ Answer: O₂, Element

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✔ Final Completed Table:

| Name of substance | Diagram of molecule | Chemical formula | Element or compound? |
|-------------------|---------------------|------------------|-----------------------|
| Water |  | H₂O | Compound |
| Nitrogen |  | N₂ | Element |
| Carbon dioxide |  | CO₂ | Compound |
| Ammonia |  | NH₃ | Compound |
| Sulphur dioxide |  | SO₂ | Compound |
| Hydrogen |  | H₂ | Element |
| Hydrogen chloride |  | HCl | Compound |
| Oxygen |  | O₂ | Element |

> *(Note: The actual images are not visible here, but based on standard conventions, the colors match common representations: red=O, white=H, blue=N, black=C, yellow=S, green=Cl.)*

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📌 Summary:

- Elements: Substances made of only one type of atom (e.g., O₂, N₂, H₂).
- Compounds: Made of two or more different atoms chemically bonded (e.g., H₂O, CO₂, etc.).

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