Edexcel IAL Chemistry AS 8.11 Ionisation energy trends down Groups 1 and 2
Edexcel IAL Chemistry AS 8.11 Ionisation energy trends down Groups 1 and 2
State the downward trend, then connect an extra occupied shell to greater radius and shielding, which weakens nuclear attraction despite increased proton number.
How this is tested
- Explain decreasing first ionisation energy through greater radius and electron shielding.
- Compare Group 1 or 2 elements by linking outer-shell attraction to ionisation energy.