Question

Electronic congregation 1 to 20

Answer 1

Answer:

what you have to do is just remember the below sequence serial wise...and remember that K shell always contains 2 electrons and remaining all shell's i.e L, M, N contain 8 electrons...each element constitutes electrons equal to its atomic no./no.of protons...you should fill it according to the capacity of each shell...1st shell will hv 2 e- always n remaining e- will go to next shell

Explanation:

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)Aluminium-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