Question

What is the electron configuration using the main energy level in a atom with the last electron that has 3d2 electron configuration

Answer 1

If given Ti2+

I would write the noble gas electron configuration like this [Ar] 3d2 4s2

And then just take away 2 e- from the last number you wrote 4s2

-Your noble gas electron configuration for Ti2+ then would be: [Ar] 3d2