Atomic Structure and Periodic Classification
26 CDS Chemistry past-year questions from 11 papers, 2018 to 2026, with answers and worked solutions.
About this chapter
- Difficulty: 9 easy · 17 moderate.
- Most-asked subtopics: Electron Configuration and the Periodic Table (12), Atomic Number, Isotopes and Isobars (8), Atomic Models (6).
- Updated 28 August 2026.
#1Atomic Models
#2Atomic Models
#3Atomic Models
#4Atomic Models
#5Atomic Models
Done a few? Here’s your next move
#6Atomic Models
#7Atomic Number, Isotopes and Isobars
#8Atomic Number, Isotopes and Isobars
#9Atomic Number, Isotopes and Isobars
#10Atomic Number, Isotopes and Isobars
#11Atomic Number, Isotopes and Isobars
#12Atomic Number, Isotopes and Isobars
#13Atomic Number, Isotopes and Isobars
#14Atomic Number, Isotopes and Isobars
#15Electron Configuration and the Periodic Table
#16Electron Configuration and the Periodic Table
#17Electron Configuration and the Periodic Table
#18Electron Configuration and the Periodic Table
#19Electron Configuration and the Periodic Table
#20Electron Configuration and the Periodic Table
#21Electron Configuration and the Periodic Table
#22Electron Configuration and the Periodic Table
#23Electron Configuration and the Periodic Table
#24Electron Configuration and the Periodic Table
#25Electron Configuration and the Periodic Table
#26Electron Configuration and the Periodic Table