Electron Configuration Question

Yes.. I am a freshman. Sorry for the dumb question to some of you...

Anyway, in 'd' my calculations always come up 1d more.
Like.. I was trying to find tin's noble gas notation, I came out with [Kr] 5s^2 5d^10 5p^2
Although, my lesson (Online schooling) said that d was 4d^10

I need help asap, I'm in the middle of a lesson and I dont want to cheat (I will learn nothing that way :/).

*Bump*

I really need to know what I am doing wrong.

This should help you:


Make sure you also count as you go along.
You need to make sure it totals up to the atomic number of the element.