Isnt the 1 supposed to represent the hypotanuse? What if its not 1? Will the equation still work?

I know this, im just wondering if d is a part of the valence shell of that energy level. People say that noble gases have full valence shells but us ut really full if d sublevel is skipped?

For the 3rd level the noble gas only full s and p levels, skipping d sublevel so the valence shell is not truely full for noble gases past argon right?

But isnt the dshell part of the valence shell of that energy level? I know you skip to the s sublevel of the next level before going back to d. Does this mean the level is not a part of the valence shell for that particular level?