Chemistry A-Level
ion configurations
What ion configurations means in Chemistry A-Level, as defined for AQA.
Definition of ion configurations
Check what you remember
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Reference: AQA
Transition metal ions lose their 4s electrons first, so iron(II) is 3d⁶ with no 4s.
Topics that use ion configurations
- Electron configuration (AQA A-Level)
Related terms
- 4s before 3d
- First ionisation energy
- Group 2 trend
- ionisation equations
- orbital capacities
- Period 3 trend
- sub-shell filling order
Using ion configurations in the exam
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