Answer :
Answer:
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Explanation:
Here are the symbols, atomic numbers, atomic masses, and electronic configurations for the first 15 elements:
1. Hydrogen (H)
- Atomic Number: 1
- Atomic Mass: 1.008
- Electronic Configuration: 1s^1
2. Helium (He)
- Atomic Number: 2
- Atomic Mass: 4.003
- Electronic Configuration: 1s^2
3. Lithium (Li)
- Atomic Number: 3
- Atomic Mass: 6.941
- Electronic Configuration: [He] 2s^1
4. Beryllium (Be)
- Atomic Number: 4
- Atomic Mass: 9.012
- Electronic Configuration: [He] 2s^2
5. Boron (B)
- Atomic Number: 5
- Atomic Mass: 10.811
- Electronic Configuration: [He] 2s^2 2p^1
6. Carbon (C)
- Atomic Number: 6
- Atomic Mass: 12.011
- Electronic Configuration: [He] 2s^2 2p^2
7. Nitrogen (N)
- Atomic Number: 7
- Atomic Mass: 14.007
- Electronic Configuration: [He] 2s^2 2p^3
8. Oxygen (O)
- Atomic Number: 8
- Atomic Mass: 15.999
- Electronic Configuration: [He] 2s^2 2p^4
9. Fluorine (F)
- Atomic Number: 9
- Atomic Mass: 18.998
- Electronic Configuration: [He] 2s^2 2p^5
10. Neon (Ne)
- Atomic Number: 10
- Atomic Mass: 20.180
- Electronic Configuration: [He] 2s^2 2p^6
11. Sodium (Na)
- Atomic Number: 11
- Atomic Mass: 22.990
- Electronic Configuration: [Ne] 3s^1
12. Magnesium (Mg)
- Atomic Number: 12
- Atomic Mass: 24.305
- Electronic Configuration: [Ne] 3s^2
13. Aluminum (Al)
- Atomic Number: 13
- Atomic Mass: 26.982
- Electronic Configuration: [Ne] 3s^2 3p^1
14. Silicon (Si)
- Atomic Number: 14
- Atomic Mass: 28.086
- Electronic Configuration: [Ne] 3s^2 3p^2
15. Phosphorus (P)
- Atomic Number: 15
- Atomic Mass: 30.974
- Electronic Configuration: [Ne] 3s^2 3p^3
Answer:
The element with the atomic number 1 is H and has the atomic mass of 1. Its valency is 1. Its electronic configuration is-
The element with the atomic number 2 is He and has the atomic mass of 4. Its valency is 0. Its electronic configuration is-
The element with the atomic number 3 is Li and has an atomic mass of 7. Its valency is 1. Its electronic configuration is-
The element with the atomic number 4 is Be and has the atomic mass of 9. Its valency is 0. Its electronic configuration is-
The element with the atomic number 5 is B and has an atomic mass of 11. Its valency is 3. Its electronic configuration is-
The element with the atomic number 6 in C has an atomic mass of 12. Its valency is 4. Its electronic configuration is-
The element with the atomic number 7 is N and has an atomic mass of 14. Its valency is 3. Its electronic configuration is-
The element with atomic number 8 is Oxygen (O) and has an atomic mass of 16. Its valency is 2. Its electronic configuration is-
The element with the atomic number 9 is F and has an atomic mass of 19. Its valency is 1. Its electronic configuration is-
The element with the atomic number 10 is Ne and has an atomic mass of 20. Its valency is 0. Its electronic configuration is-
The element with the atomic number 11 is Na and has an atomic mass of 23. Its valency is 1. Its electronic configuration is-
The element with the atomic number 12 is Mg and has an atomic mass of 24. Its valency is 2. Its electronic configuration is-
The element with the atomic number 13 is Al and has an atomic mass of 27. Its valency is 3. Its electronic configuration is-
The element with the atomic number 14 is Si and has an atomic mass of 28. Its valency is 4. Its electronic configuration is-
The element with the atomic number 15 is P and has an atomic mass of 31. Its valency is 3. Its electronic configuration is-
Explanation: