D Block Lower Energy than the S Block

[205696343]

I think we may have gone over this in class, but why does the 3d block come before the 4s block in terms of energy, when it lies after the 4s block on the periodic table? In the context of this question, why is it that electrons are lost from the 4s sub shell before they are lost from the 3d sub shell?

[Carina H - 2G]

Hi!

Even though in the periodic table, 3d comes before 4s sequentially, when we create electron configurations, we are doing it in increasing energy. 3d lies in the n = 3 energy level which is lower in energy than where the 4s is located, in the n = 4 energy level, which has a higher energy than n = 3. Hope this helped!

[Victoria Sigala 2A]

Hey! The 3d block comes in front of the 4s block when the 3d orbital becomes lower in energy than 4s which happens from Scandium and onwards. Hopes this helps!

[Nayeli Valtierra 2F]

Hey!
I was also kind of confused about this but I believe that the 3d block comes before the 4s block because the 3rd energy level is lower in energy.

[Nayeli Valtierra 2F]

Hey!
I was also kind of confused about this but I believe that the 3d block comes before the 4s block because the 3rd energy level is lower in energy.

[Nayeli Valtierra 2F]

Hey!
I was also kind of confused about this but I believe that the 3d block comes before the 4s block because the 3rd energy level is lower in energy.