Edexcel IAL Chemistry AS 3.7 Trends in ionic radii
Edexcel IAL Chemistry AS 3.7 Trends in ionic radii
Check whether the ions are isoelectronic, then compare proton number and attraction; for group trends, compare occupied shells before reading or plotting radius data.
How this is tested
- Order isoelectronic ions by increasing proton number and decreasing ionic radius.
- Explain larger radii down a group through additional occupied electron shells.
- Estimate an ionic radius from a table or straight line of best fit with units.