Electron arrangement worksheet with Bohr models for various elements.

Let's solve this Electron Arrangement worksheet step by step. The goal is to:

1. Fill in the correct number of protons, neutrons, and electrons.
2. Identify the atomic number and atomic mass for each element.
3. Draw the electron arrangement (Bohr model) showing electrons in shells.

We’ll use information from the periodic table for each element.

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🔬 Key Concepts:

- Atomic Number = Number of protons = Number of electrons (in a neutral atom)
- Atomic Mass ≈ Protons + Neutrons (rounded to nearest whole number)
- Neutrons = Atomic Mass − Atomic Number
- Electrons fill shells in order:
- 1st shell → max 2 electrons
- 2nd shell → max 8 electrons
- 3rd shell → max 8 (for these elements)

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Now let’s go through each element one by one.

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🌟 Hydrogen (H)

- Atomic Number: 1 → So, 1 proton
- Atomic Mass: ~1 (most common isotope: Hydrogen-1)
- Neutrons: 1 − 1 = 0
- Electrons: 1 (neutral atom)

Bohr Model:
- 1 electron in the first shell (closest to nucleus).

✔ Fill in:
- Protons: 1
- Neutrons: 0
- Electrons: 1
- Atomic Number: 1
- Atomic Mass: 1

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🌟 Carbon (C)

- Atomic Number: 6 → 6 protons
- Atomic Mass: ~12 (most common isotope: Carbon-12)
- Neutrons: 12 − 6 = 6
- Electrons: 6

Electron Shells:
- 1st shell: 2 electrons
- 2nd shell: 4 electrons

✔ Fill in:
- Protons: 6
- Neutrons: 6
- Electrons: 6
- Atomic Number: 6
- Atomic Mass: 12

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🌟 Oxygen (O)

- Atomic Number: 8 → 8 protons
- Atomic Mass: ~16 (Oxygen-16)
- Neutrons: 16 − 8 = 8
- Electrons: 8

Electron Shells:
- 1st shell: 2 electrons
- 2nd shell: 6 electrons

✔ Fill in:
- Protons: 8
- Neutrons: 8
- Electrons: 8
- Atomic Number: 8
- Atomic Mass: 16

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🌟 Sulfur (S)

- Atomic Number: 16 → 16 protons
- Atomic Mass: ~32 (Sulfur-32)
- Neutrons: 32 − 16 = 16
- Electrons: 16

Electron Shells:
- 1st shell: 2
- 2nd shell: 8
- 3rd shell: 6

✔ Fill in:
- Protons: 16
- Neutrons: 16
- Electrons: 16
- Atomic Number: 16
- Atomic Mass: 32

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🌟 Nitrogen (N)

- Atomic Number: 7 → 7 protons
- Atomic Mass: ~14 (Nitrogen-14)
- Neutrons: 14 − 7 = 7
- Electrons: 7

Electron Shells:
- 1st shell: 2
- 2nd shell: 5

✔ Fill in:
- Protons: 7
- Neutrons: 7
- Electrons: 7
- Atomic Number: 7
- Atomic Mass: 14

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🌟 Boron (B)

- Atomic Number: 5 → 5 protons
- Atomic Mass: ~11 (Boron-11)
- Neutrons: 11 − 5 = 6
- Electrons: 5

Electron Shells:
- 1st shell: 2
- 2nd shell: 3

✔ Fill in:
- Protons: 5
- Neutrons: 6
- Electrons: 5
- Atomic Number: 5
- Atomic Mass: 11

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🌟 Helium (He)

- Atomic Number: 2 → 2 protons
- Atomic Mass: ~4 (Helium-4)
- Neutrons: 4 − 2 = 2
- Electrons: 2

Electron Shells:
- 1st shell: 2 electrons (full)

✔ Fill in:
- Protons: 2
- Neutrons: 2
- Electrons: 2
- Atomic Number: 2
- Atomic Mass: 4

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✔ Summary Table

| Element | Protons | Neutrons | Electrons | Atomic Number | Atomic Mass |
|------------|---------|----------|-----------|---------------|-------------|
| Hydrogen | 1 | 0 | 1 | 1 | 1 |
| Carbon | 6 | 6 | 6 | 6 | 12 |
| Oxygen | 8 | 8 | 8 | 8 | 16 |
| Sulfur | 16 | 16 | 16 | 16 | 32 |
| Nitrogen | 7 | 7 | 7 | 7 | 14 |
| Boron | 5 | 6 | 5 | 5 | 11 |
| Helium | 2 | 2 | 2 | 2 | 4 |

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💡 How to Draw the Bohr Models:

For each element:
- Draw the nucleus (blue dot).
- Draw concentric circles (shells).
- Place electrons as dots on shells, starting from the innermost.

#### Example: Oxygen
- 1st shell (inner): 2 electrons
- 2nd shell (outer): 6 electrons

Repeat for others accordingly.

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✔ Final Answer:

You can now fill in the worksheet with the values above. For example:

> Hydrogen
> Protons: 1
> Neutrons: 0
> Electrons: 1
> Atomic Number: 1
> Atomic Mass: 1

And so on for each element.

Let me know if you'd like a visual version or help drawing the Bohr models!