Unit 3 · Structure 3: Classification of matter · Topic 3.1

IB Chemistry HL — The periodic table: classification of elements

Topic 3.1 of IB Chemistry covers The periodic table: classification of elements, which is part of Unit 3: Structure 3: Classification of matter. Students explore key concepts including The periodic table: periods, groups and blocks, Periodic trends in atomic properties, Chemical trends of groups and period 3, and more. A strong understanding of the periodic table: classification of elements is essential for IB Chemistry HL exams and builds the foundation for connected topics across the syllabus.

Higher Level students should use this topic hub as a map: start with the shared sub-topics, then follow the HL-only extensions and exam-skill links where this topic asks for deeper analysis.

Exam technique guide Practice questions

What you'll learn in Topic 3.1

3.1.1 The periodic table: periods, groups and blocks
3.1.2 Periodic trends in atomic properties
3.1.3 Chemical trends of groups and period 3
3.1.4 Transition elements and oxidation states (HL)
3.1.5 Coloured complexes and d-orbital splitting (HL)

Suggested study order: Read the notes for each sub-topic below → test yourself with flashcards → attempt practice questions → review exam technique.

Study resources — 3.1 The periodic table: classification of elements

3.1.1

The periodic table: periods, groups and blocks

Notes

3.1.2

Periodic trends in atomic properties

Notes

3.1.3

Chemical trends of groups and period 3

Notes

3.1.4

Transition elements and oxidation states (HL)

Notes

3.1.5

Coloured complexes and d-orbital splitting (HL)

Notes

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Topic 3.1 The periodic table: classification of elements forms a core part of Unit 3: Structure 3: Classification of matter in IB Chemistry HL. Mastering these concepts will strengthen your understanding of connected topics across the syllabus and prepare you for exam questions that require analysis, evaluation, and real-world application.

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IB Chemistry HL — The periodic table: classification of elements

Higher Level students should use this topic hub as a map: start with the shared sub-topics, then follow the HL-only extensions and exam-skill links where this topic asks for deeper analysis.