CAIE A-Level Chemistry 1.1.7 Atomic and Ionic Radius Trends
Practise explaining radius changes across periods, down groups and between atoms and ions.
- Syllabus
- 2028–2030
- Course
- Chemistry 9701
- Level
- AS
Exam points
- explain decreasing atomic radius across a period by rising nuclear charge with similar shielding
- explain increasing radius down a group by addition of electron shells and greater shielding
- rank isoelectronic species by nuclear charge and explain why cations shrink while anions expand
1.1.7—Trends: the variations in atomic radius question 1
[Maximum number: 2]
The Group 2 elements form stable 2+ cations.
State and explain the variation in ionic radius of the Group 2 elements down the group.
ionic radius increases / ions larger (down the group)
extra shell (of electrons)
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