SSC CGL Chemistry · Free notes
Atomic Structure and Periodic Table: SSC CGL Chemistry
Atomic Structure and Periodic Classification has 30 questions in the SSC CGL Tier I bank: 20 from the 2023 shifts and ten from the 2024 shifts, and none from the 2025 shifts. Twenty-one are on the periodic table: Newlands and Mendeleev with their years, group names and trends. The rest ask element names and early atomic theory.
The handout has every subtopic, worked example, formula and trap with answers shown. The formula sheet is the chapter’s formulas and traps alone, on one page.
Subtopic notes
The Periodic Table
21 PYQsNewlands' octaves and Mendeleev's table with their years and predictions, the group names and numbers, the blocks, and how atomic size changes across the table.
Atoms and Elements
9 PYQsElement symbols and names from Latin, the heavy elements named after scientists, Dalton's atomic theory, Rutherford's gold foil, and chlorine's two isotopes.
Formula & revision sheet
0 formulas · 4 reference tables · 4 gotchas across all subtopics — the exam-eve cheat-sheet
Formula & revision sheet
0 formulas · 4 reference tables · 4 gotchas across all subtopics — the exam-eve cheat-sheet
Reference tables (2)
Watch out for (2)
- Hydrogen is the lightest, not the heaviest→ Newlands and Mendeleev
- Lanthanides are f-block→ Groups, periods, blocks and trends
Reference tables (2)
Watch out for (2)
- Au is gold, Ag is silver→ Element names and symbols
- Dalton, not Avogadro→ Atomic theory and isotopes
PYQ weightage by concept
4 concepts · 30 PYQs — where the marks actually sit, so you know what to drill first
PYQ weightage by concept
4 concepts · 30 PYQs — where the marks actually sit, so you know what to drill first
| Concept | PYQs | Share |
|---|---|---|
| Groups, periods, blocks and trends | 14 | 47% |
| Newlands and Mendeleev | 7 | 23% |
| Concept | PYQs | Share |
|---|---|---|
| Element names and symbols | 5 | 17% |
| Atomic theory and isotopes | 4 | 13% |
Test yourself on Atomic Structure and Periodic Classification
15 past SSC CGL questions from this chapter, timed at 9 minutes and marked the way the exam marks it. You see your score and every answer the moment you finish. Free to start.