Bohr Model Worksheet for drawing electron configurations of various elements.

Let's solve this Bohr Model Worksheet step by step. The goal is to draw the electron configuration for each element using the Bohr model, where:

- Inner electrons are drawn in blue
- Valence (outer) electrons are drawn in red
- Each circle represents an electron shell (energy level)
- Electrons are placed in shells according to the maximum capacity per shell:
- 1st shell: 2 electrons
- 2nd shell: 8 electrons
- 3rd shell: 8 electrons (for these elements, we won’t go beyond that)

We’ll determine the number of electrons for each atom (equal to atomic number), then fill the shells from the inside out.

---

🔹 Step-by-step Instructions:

1. Find the atomic number of each element.
2. Fill electrons into shells in order: 2 → 8 → 8 → ...
3. Inner electrons = all electrons except those in the outermost shell
4. Valence electrons = electrons in the outermost shell
5. Color inner electrons blue, valence electrons red

---

Now let’s go through each element:

---

1. Sodium (Na) – Atomic Number: 11

- Electrons: 11
- Shell 1: 2 e⁻ (inner) → blue
- Shell 2: 8 e⁻ (inner) → blue
- Shell 3: 1 e⁻ (valence) → red

✔ Draw:
- 2 blue dots in 1st shell
- 8 blue dots in 2nd shell
- 1 red dot in 3rd shell

---

2. Aluminum (Al) – Atomic Number: 13

- Electrons: 13
- Shell 1: 2 e⁻ (inner) → blue
- Shell 2: 8 e⁻ (inner) → blue
- Shell 3: 3 e⁻ (valence) → red

✔ Draw:
- 2 blue in 1st
- 8 blue in 2nd
- 3 red in 3rd

---

3. Carbon (C) – Atomic Number: 6

- Electrons: 6
- Shell 1: 2 e⁻ (inner) → blue
- Shell 2: 4 e⁻ (valence) → red

✔ Draw:
- 2 blue in 1st
- 4 red in 2nd

---

4. Silicon (Si) – Atomic Number: 14

- Electrons: 14
- Shell 1: 2 e⁻ (inner) → blue
- Shell 2: 8 e⁻ (inner) → blue
- Shell 3: 4 e⁻ (valence) → red

✔ Draw:
- 2 blue in 1st
- 8 blue in 2nd
- 4 red in 3rd

---

5. Oxygen (O) – Atomic Number: 8

- Electrons: 8
- Shell 1: 2 e⁻ (inner) → blue
- Shell 2: 6 e⁻ (valence) → red

✔ Draw:
- 2 blue in 1st
- 6 red in 2nd

---

6. Chlorine (Cl) – Atomic Number: 17

- Electrons: 17
- Shell 1: 2 e⁻ (inner) → blue
- Shell 2: 8 e⁻ (inner) → blue
- Shell 3: 7 e⁻ (valence) → red

✔ Draw:
- 2 blue in 1st
- 8 blue in 2nd
- 7 red in 3rd

---

7. Fluorine (F) – Atomic Number: 9

- Electrons: 9
- Shell 1: 2 e⁻ (inner) → blue
- Shell 2: 7 e⁻ (valence) → red

✔ Draw:
- 2 blue in 1st
- 7 red in 2nd

---

8. Phosphorus (P) – Atomic Number: 15

- Electrons: 15
- Shell 1: 2 e⁻ (inner) → blue
- Shell 2: 8 e⁻ (inner) → blue
- Shell 3: 5 e⁻ (valence) → red

✔ Draw:
- 2 blue in 1st
- 8 blue in 2nd
- 5 red in 3rd

---

9. Lithium (Li) – Atomic Number: 3

- Electrons: 3
- Shell 1: 2 e⁻ (inner) → blue
- Shell 2: 1 e⁻ (valence) → red

✔ Draw:
- 2 blue in 1st
- 1 red in 2nd

---

✔ Summary Table:

| Element | Atomic # | Electron Configuration | Inner (Blue) | Valence (Red) |
|--------|----------|------------------------|---------------|----------------|
| Na | 11 | 2, 8, 1 | 2 + 8 = 10 | 1 |
| Al | 13 | 2, 8, 3 | 10 | 3 |
| C | 6 | 2, 4 | 2 | 4 |
| Si | 14 | 2, 8, 4 | 10 | 4 |
| O | 8 | 2, 6 | 2 | 6 |
| Cl | 17 | 2, 8, 7 | 10 | 7 |
| F | 9 | 2, 7 | 2 | 7 |
| P | 15 | 2, 8, 5 | 10 | 5 |
| Li | 3 | 2, 1 | 2 | 1 |

---

🎯 Final Answer (How to Draw):

For each diagram:
- Start with nucleus (black dot).
- Draw concentric circles as shells.
- Place electrons as dots on the circles.
- Use blue for inner electrons (all except outermost shell).
- Use red for valence (outermost) electrons.

> Example: For Oxygen (O):
> - 1st shell: 2 blue dots
> - 2nd shell: 6 red dots

You can now complete the worksheet accordingly.

---

💡 Tip: Remember that valence electrons determine chemical behavior and bonding!

Let me know if you’d like a visual version or printable guide!