Inorganic · Chemical Periodicity
Chemical Periodicity
Exam-focused revision notes on Chemical Periodicity for CSIR-NET Chemical Sciences, GATE Chemistry and IIT-JAM — the core concepts, the formulas worth memorising, the traps that cost marks, and a quick-recall table.
One cause, not a list of trends
Every periodic trend in this unit comes from one quantity: the effective nuclear charge felt by the outermost electron, and how far out that electron sits. Learn to compute Zeff and the trends stop needing memorising.
What this note covers
- 1One cause, not a list of trends
- 2Shielding, penetration and Slater's rules
- 3Atomic and ionic radii
- 4Ionisation energy — and its two famous breaks
- 5Electron gain enthalpy
- 6Electronegativity — three scales
- 7Diagonal relationships
- 8Common traps students miss
- 930-second recall table
Read the full note
The remaining 8 sections — including the worked examples, the common-traps list and the quick-recall table — are part of ChemVidya Full Access, along with 6,000+ practice questions.
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