Question

give a schematic representation of arrangement of electrons for the first 18 elements​

Answer 1

➣ To Do

To systematically represent first 18 elements.

➣ Answer

Here is the systematic representation of electron for first 20 elements.

1. Hydrogen - 1
2. Helium - 2
3. Lithium - 2 , 1
4. Beryllium - 2 , 2
5. Boron - 2 , 3
6. Carbon - 2 , 4
7. Nitrogen - 2 , 5
8. Oxygen - 2 , 6
9. Fluorine - 2 , 7
10. Neon - 2 , 8
11. Sodium - 2 , 8 , 1
12. Magnesium - 2 , 8 , 2
13. Aluminum - 2 , 8 , 3
14. Silicon - 2 , 8 , 4
15. Phosphorus - 2 , 8 , 5
16. Sulphur - 2 , 8 , 6
17. Chlorine - 2 , 8 , 7
18. Argon - 2 , 8 , 8
19. Potassium - 2 , 8 , 8 , 1
20. Calcium - 2 , 8 , 8 , 2

[ Note - Image of electronic configuration is also attached above ]

______________________

➣ More to Know

• Electronic Configuration - It is the arrangement of electrons in the various shells of an atom of an element.

• Valence electron - The electron present in the outermost shell of an atom are known as valence electron.

• Electron was discovered by J.J. Thomson.

• Proton was discovered by E. Goldstein.

• Neutron was discovered by James Chadwick.

_____________________