Answer :
Answer:
Here are the first 20 elements of the periodic table along with their atomic number, electronic configuration, and electronic dot structure (Lewis dot structure):
1. **Hydrogen**
- Atomic number: 1
- Electronic configuration: 1s¹
- Electronic dot structure: H •
2. **Helium**
- Atomic number: 2
- Electronic configuration: 1s²
- Electronic dot structure: He ••
3. **Lithium**
- Atomic number: 3
- Electronic configuration: 1s² 2s¹
- Electronic dot structure: Li •
4. **Beryllium**
- Atomic number: 4
- Electronic configuration: 1s² 2s²
- Electronic dot structure: Be ••
5. **Boron**
- Atomic number: 5
- Electronic configuration: 1s² 2s² 2p¹
- Electronic dot structure: B •
6. **Carbon**
- Atomic number: 6
- Electronic configuration: 1s² 2s² 2p²
- Electronic dot structure: C ••
7. **Nitrogen**
- Atomic number: 7
- Electronic configuration: 1s² 2s² 2p³
- Electronic dot structure: N •
8. **Oxygen**
- Atomic number: 8
- Electronic configuration: 1s² 2s² 2p⁴
- Electronic dot structure: O ••
9. **Fluorine**
- Atomic number: 9
- Electronic configuration: 1s² 2s² 2p⁵
- Electronic dot structure: F •
10. **Neon**
- Atomic number: 10
- Electronic configuration: 1s² 2s² 2p⁶
- Electronic dot structure: Ne ••
11. **Sodium**
- Atomic number: 11
- Electronic configuration: 1s² 2s² 2p⁶ 3s¹
- Electronic dot structure: Na •
12. **Magnesium**
- Atomic number: 12
- Electronic configuration: 1s² 2s² 2p⁶ 3s²
- Electronic dot structure: Mg ••
13. **Aluminum**
- Atomic number: 13
- Electronic configuration: 1s² 2s² 2p⁶ 3s² 3p¹
- Electronic dot structure: Al •
14. **Silicon**
- Atomic number: 14
- Electronic configuration: 1s² 2s² 2p⁶ 3s² 3p²
- Electronic dot structure: Si ••
15. **Phosphorus**
- Atomic number: 15
- Electronic configuration: 1s² 2s² 2p⁶ 3s² 3p³
- Electronic dot structure: P •
16. **Sulfur**
- Atomic number: 16
- Electronic configuration: 1s² 2s² 2p⁶ 3s² 3p⁴
- Electronic dot structure: S ••
17. **Chlorine**
- Atomic number: 17
- Electronic configuration: 1s² 2s² 2p⁶ 3s² 3p⁵
- Electronic dot structure: Cl •
18. **Argon**
- Atomic number: 18
- Electronic configuration: 1s² 2s² 2p⁶ 3s² 3p⁶
- Electronic dot structure: Ar ••
19. **Potassium**
- Atomic number: 19
- Electronic configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹
- Electronic dot structure: K •
20. **Calcium**
- Atomic number: 20
- Electronic configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 4s²
- Electronic dot structure: Ca ••
These electronic dot structures (Lewis dot structures) show the valence electrons (outermost electrons) for each element, represented as dots around the symbol of the element.
Explanation: