Free Printable Electron Configuration Orbital Diagram Worksheets - Free Printable

Let's solve each element step by step, providing:

- Full electron configuration
- Short-hand (noble gas) electron configuration
- Orbital diagram (using arrows to represent electrons in orbitals)

We'll follow the Aufbau principle, Pauli exclusion principle, and Hund’s rule.

---

1. Nitrogen (N)

- Atomic number: 7 → 7 electrons

#### Full:
1s² 2s² 2p³

#### Short-hand:
[He] 2s² 2p³

#### Orbital Diagram:
```
1s: ↑↓
2s: ↑↓
2p: ↑ ↑ ↑
```

(Each box represents an orbital. The 2p subshell has three orbitals: 2px, 2py, 2pz. Electrons fill singly first before pairing.)

✔ Filling:
- 1s: 2 electrons (paired)
- 2s: 2 electrons (paired)
- 2p: 3 electrons — one in each of the three orbitals (unpaired, following Hund’s rule)

---

2. Sodium (Na)

- Atomic number: 11 → 11 electrons

#### Full:
1s² 2s² 2p⁶ 3s¹

#### Short-hand:
[Ne] 3s¹

#### Orbital Diagram:
```
1s: ↑↓
2s: ↑↓
2p: ↑↓ ↑↓ ↑↓
3s: ↑
```

- 1s, 2s, 2p are fully filled (10 electrons)
- 3s has 1 unpaired electron

---

3. Chlorine (Cl)

- Atomic number: 17 → 17 electrons

#### Full:
1s² 2s² 2p⁶ 3s² 3p⁵

#### Short-hand:
[Ne] 3s² 3p⁵

#### Orbital Diagram:
```
1s: ↑↓
2s: ↑↓
2p: ↑↓ ↑↓ ↑↓
3s: ↑↓
3p: ↑↓ ↑↓ ↑
```

- 3p has 5 electrons → two orbitals are paired, one has a single electron (unpaired)

---

4. Calcium (Ca)

- Atomic number: 20 → 20 electrons

#### Full:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s²

#### Short-hand:
[Ar] 4s²

#### Orbital Diagram:
```
1s: ↑↓
2s: ↑↓
2p: ↑↓ ↑↓ ↑↓
3s: ↑↓
3p: ↑↓ ↑↓ ↑↓
4s: ↑↓
```

- All orbitals up to 4s are filled.
- 4s is full (2 electrons), no unpaired electrons.

---

5. Gallium (Ga)

- Atomic number: 31 → 31 electrons

#### Full:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹

> Note: Order of filling is 4s before 3d, but in writing configurations, we list by shell (n):
> So after 4s² comes 3d¹⁰, then 4p¹.

#### Short-hand:
[Ar] 4s² 3d¹⁰ 4p¹

#### Orbital Diagram:
```
1s: ↑↓
2s: ↑↓
2p: ↑↓ ↑↓ ↑↓
3s: ↑↓
3p: ↑↓ ↑↓ ↑↓
4s: ↑↓
3d: ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ (10 electrons, all paired)
4p: ↑
```

- 3d is completely filled (10 electrons)
- 4p has 1 electron → unpaired

---

6. Krypton (Kr)

- Atomic number: 36 → 36 electrons

#### Full:
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶

#### Short-hand:
[Kr] → but since it's Kr itself, short-hand is just [Kr] or sometimes written as [Kr]

But for completeness:
- Full: same as above
- Short-hand: [Kr] (it's a noble gas, so its configuration is used as reference)

#### Orbital Diagram:
All orbitals up to 4p are filled.

```
1s: ↑↓
2s: ↑↓
2p: ↑↓ ↑↓ ↑↓
3s: ↑↓
3p: ↑↓ ↑↓ ↑↓
4s: ↑↓
3d: ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓
4p: ↑↓ ↑↓ ↑↓
```

- All orbitals are filled → no unpaired electrons

---

✔ Summary Table:

| Element | Full Configuration | Short-hand |
|----------|--------------------------------------------|-----------------------|
| Nitrogen | 1s² 2s² 2p³ | [He] 2s² 2p³ |
| Sodium | 1s² 2s² 2p⁶ 3s¹ | [Ne] 3s¹ |
| Chlorine | 1s² 2s² 2p⁶ 3s² 3p⁵ | [Ne] 3s² 3p⁵ |
| Calcium | 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² | [Ar] 4s² |
| Gallium | 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹ | [Ar] 4s² 3d¹⁰ 4p¹ |
| Krypton | 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ | [Kr] |

---

🔧 How to Fill Orbital Diagrams:

- Each box = one orbital
- Arrows (↑↓) = electrons; ↑ = spin-up, ↓ = spin-down
- Pauli Exclusion: Only 2 electrons per orbital, opposite spins
- Hund’s Rule: Fill orbitals singly before pairing (for degenerate orbitals like p, d, f)

---

Final Answer (to fill in the worksheet):

#### 1. Nitrogen
- Full: 1s² 2s² 2p³
- Short-hand: [He] 2s² 2p³
- Orbital Diagram:
```
1s: ↑↓ 2s: ↑↓ 2p: ↑ ↑ ↑
```

#### 2. Sodium
- Full: 1s² 2s² 2p⁶ 3s¹
- Short-hand: [Ne] 3s¹
- Orbital Diagram:
```
1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑
```

#### 3. Chlorine
- Full: 1s² 2s² 2p⁶ 3s² 3p⁵
- Short-hand: [Ne] 3s² 3p⁵
- Orbital Diagram:
```
1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑↓ 3p: ↑↓ ↑↓ ↑
```

#### 4. Calcium
- Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
- Short-hand: [Ar] 4s²
- Orbital Diagram:
```
1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑↓ 3p: ↑↓ ↑↓ ↑↓ 4s: ↑↓
```

#### 5. Gallium
- Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p¹
- Short-hand: [Ar] 4s² 3d¹⁰ 4p¹
- Orbital Diagram:
```
1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑↓ 3p: ↑↓ ↑↓ ↑↓ 4s: ↑↓ 3d: ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ 4p: ↑
```

#### 6. Krypton
- Full: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶
- Short-hand: [Kr]
- Orbital Diagram:
```
1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑↓ 3p: ↑↓ ↑↓ ↑↓ 4s: ↑↓ 3d: ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ 4p: ↑↓ ↑↓ ↑↓
```

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✔ All answers follow standard rules and are correct for the given elements.

Let me know if you'd like this formatted as a printable answer sheet!