On the given elements in the periodic table, write their electron configurations and their corresponding chemical symbols.
Ex: Helium- He (18)
1. Lithium
2. Boron
3. Hydrogen
4. Nitrogen
5. Oxygen
6. Potassium
7. Flourine
8. Carbon
9. Sodium
10. Aluminum
11. Phosphorus
12. Argon
13. Magnesium
14. Neon
15. Calcium

Explanation:

1. Lithium  - Li 2s1

2. Boron  - B 2s2 2p1

3. Hydrogen  - H 1s1

4. Nitrogen  - N 2s2 2p3

5. Oxygen  - O 2s² 2p⁴

6. Potassium  - K 4s¹

7. Fluorine  - F 2s2 2p5

8. Carbon  - C 2s22p2

9. Sodium  - Na 3s¹

10. Aluminum  - Al 3s² 3p¹

11. Phosphorus  - P 3s² 3p³

12. Argon  - Ar 3s² 3p⁶

13. Magnesium  - Mg 3s2

14. Neon  - Ne 2s²2p⁶

15. Calcium - Ca 4s²

first, the romans stayed isolated because they had to defend their own territories from neighboring cities that were harassing them, like the etruscans. second, once the romans managed to defeat their neighbors, and started to expand their territory, they started to build roads and bridges. finally, now that the romans have covered their territory with roads functioning as highways, they could mobilize their legions faster to assemble larger military units in a specific place

answer; i believe that the correct answer is (scientific approach)