Electron Configuration

[Qester]

Hello,

I am getting confused with the addition and subtraction of electrons. I understand transition metal D orbitals and the rule to make empty half or full shells when possible

1) If an electron goes from 4s to 3d does it absorb or emit energy?
2) If an electron goes from 4p to 3d does it absorb or emit energy?
3) when adding an electron does it go in the lowest available energy shell first (4s) or the lowest principle number (3d)?
4) when removing an electron do we remove from 4s or 3d?

---

Members don't see this ad.

 

[QrtrLifeCrisis]

1) If an electron goes from 4s to 3d does it absorb or emit energy?

Absorb.

2) If an electron goes from 4p to 3d does it absorb or emit energy?

Release.

3) when adding an electron does it go in the lowest available energy shell first (4s) or the lowest principle number (3d)?

See below.

4) when removing an electron do we remove from 4s or 3d?

When you fill electrons, you fill using the electron-filling diagram. If you don't know what I'm talking about, refer to this:

Most importantly, know that you add to 4s before you add to 3d. The two notable exceptions are Cr and Cu, where the 4s orbital likes to be half-filled.

When removing electrons, you remove from the highest n shell. So, you remove from 4s before you remove from 3d. (I know this one is weird, but trust me on it.)

 

[Qester]

Thanks for the clarification