CBSE 11 Chemistry · U3
Classification of Elements and Periodicity in Properties
CBSE Class 11 Chemistry Unit III: need and genesis of periodic classification, modern periodic law, present periodic table, temporary IUPAC nomenclature for elements with atomic number greater than 100, electronic configuration and blocks, and periodic trends in element properties.
Test yourself
A focused, distraction-free run through 50 multiple-choice questions. Hints if you need them; your score at the end.
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Topic 3.1
Need, Genesis and Modern Periodic Law
Why classification is needed, early classification, Mendeleev, Moseley and modern periodic law
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Topic 3.2
Present Periodic Table and IUPAC Nomenclature
Long-form table, periods, groups, blocks and temporary systematic names for elements with atomic number greater than 100
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Topic 3.3
Electronic Configuration and Types of Elements
Configuration-based placement, representative, transition, inner-transition and noble-gas elements
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Topic 3.4
Atomic and Ionic Radii
Atomic radius, covalent and van der Waals ideas, ionic radius, cation/anion size and isoelectronic series
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Topic 3.5
Ionisation, Electron Gain and Electronegativity Trends
Ionisation enthalpy, electron gain enthalpy, electronegativity, valency, metallic character and oxide character
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