In the introduction of the chapter metal and non-metals there is a subtopic called microscopic world. In the video they are talking about shells surrounding the protons. In my school I am being taught that that the third shell has a valency of 8 but in the video they are saying that the third shell has 18 valency. Please tell me the solution for the same. Thank you.

In the introduction of the chapter metal and non-metals there is a sub

1.	In the introduction of the chapter metal and non-metals there is a subtopic called microscopic world. In the video they are talking about shells surrounding the protons. In my school I am being taught that that the third shell has a valency of 8 but in the video they are saying that the third shell has 18 valency. Please tell me the solution for the same. Thank you.
Answer» In the introduction of the chapter metal and non-metals there is a subtopic called microscopic world. In the video they are talking about shells surrounding the protons. In my school I am being taught that that the third shell has a valency of 8 but in the video they are saying that the third shell has 18 valency. Please tell me the solution for the same. Thank you.