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.

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A focused, distraction-free run through 50 multiple-choice questions. Hints if you need them; your score at the end.

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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

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

Topic 3.3

Electronic Configuration and Types of Elements

Configuration-based placement, representative, transition, inner-transition and noble-gas elements

Topic 3.4

Atomic and Ionic Radii

Atomic radius, covalent and van der Waals ideas, ionic radius, cation/anion size and isoelectronic series

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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