Edexcel IAL Chemistry A2 17.2 Period 4 d-block electronic configurations
Edexcel IAL Chemistry A2 17.2 Period 4 d-block electronic configurations

Pearson Edexcel IAL Chemistry syllabusChemistry YCH11First assessment 2019
Remove 4s electrons first when forming ions, remember chromium and copper exceptions, and use d-orbital occupancy to justify stability or unpaired electrons.
How this is tested
- Deduce d-block ion configurations such as Zn2+, Fe2+, Ni2+ and Cu+ from charge.
- Use chromium and copper exceptions when writing Period 4 atom configurations.
- Explain stability or redox behaviour from half-filled or filled 3d subshells.