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📊 Master Classification of Elements & Periodicity
NCERT Class 11 · Chapter 3

Real PYQs from top competitive exams — filter by exam, attempt each question, track your progress and submit to see your full score report.

Attempt PYQs Study Strategy
Periodic TrendsIonization EnergyElectron AffinityAtomic RadiusElectronegativity
1H
2He
3Li
4Be
5B
6C
7N
8O
9F
10Ne
11Na
12Mg
13Al
14Si
15P
16S
50
Real PYQs
5
Exam Bodies
15+
Years Covered
~7%
Exam Weightage
PYQs Overview
📈
Periodic Trends Overview
IE, EA, EN, atomic/ionic radius trends across periods and groups.
★★★★★
91% Frequency
⚡
Ionization Energy
First IE trends, anomalies (Be>B, N>O), successive IE applications.
★★★★★
91% Frequency
🔴
Atomic & Ionic Radius
Covalent, van der Waals, metallic radii; cation < atom < anion rule.
★★★★☆
86% Frequency
⚗️
Electron Affinity
Halogens trend, anomalies (F < Cl), gaseous state convention.
★★★★☆
72% Frequency
🔗
Electronegativity
Pauling scale, bond polarity, diagonal relationship.
★★★☆☆
78% Frequency
🗂️
Periodicity & Valence
s,p,d,f block elements; valence electron count; group rules.
★★★★☆
65% Frequency
Topic Frequency
Ionization Energy Trends 91%
Atomic Radius Trends 86%
Electronegativity 78%
Electron Affinity 72%
Periodicity of Valence 65%
Block Classification 58%
Diagonal Relationship 42%
💡 Did You Know?
  • IE anomaly (Be>B, N>O) asked 11× since 2005
  • NEET asks 1–2 trend questions yearly
  • Diagonal relationship — every 3 years in JEE
  • Atomic radius trend — zero skips in 12 yrs
  • Theory = ~80% of marks
Key Takeaways
🔑
Across a period: IE increases, radius decreases
More protons, same shell — stronger nuclear pull.
⚡
Be>B and N>O ionization anomalies
Fully-filled 2s (Be) and half-filled 2p (N) are extra stable.
📐
Cl has higher EA than F
F's small size causes e⁻–e⁻ repulsion in compact 2p orbital.
🌊
Ionic radius: cation < atom < anion
Removing electrons contracts; adding electrons expands the cloud.
🧮
Electronegativity: F is highest (4.0 Pauling)
Decreases down a group; increases left-to-right across a period.
🎯
Diagonal: Li≈Mg, Be≈Al, B≈Si
Charge/radius ratio similarity causes isodiagonal properties.
Study Strategy
1
Map the Periodic TableDay 1–2
Every trend direction for IE, EA, EN, radius. Make a visual trend map.
2
Anomalies & ExceptionsDay 3
Be>B, N>O, F<Cl EA, diagonal relationships — exam favourites.
3
Comparison PracticeDay 4–5
Arrange elements in order of IE, radius, EA, EN — 30+ sets.
4
Attempt All PYQsDay 6–7
Focus on anomaly-based MCQs; they appear every year.
5
Mock & RevisionDay 8
30-Q timed; target "which has highest/lowest" style questions.
🗓️ 8-Day Chapter Plan
Day 1–2 Map the Periodic Table
Day 3 Anomalies & Exceptions
Day 4–5 Comparison Practice
Day 6–7 Attempt All PYQs
Day 8 Mock & Revision
🧠 Pro Tip: This chapter is ~80% conceptual. Anomalies (Be>B, N>O, Cl>F for EA) account for 40% of questions.
🚀

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CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES – Learning Resources

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