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NotesChemistry HLTopic 1.2
Unit 1 · Structure 1: Models of the particulate nature of matter · Topic 1.2

IB Chemistry HL — The nuclear atom

Topic 1.2 of IB Chemistry covers The nuclear atom, which is part of Unit 1: Structure 1: Models of the particulate nature of matter. Students explore key concepts including Subatomic particles and the nuclear atom, Isotopes, Relative atomic mass and the mass spectrometer. A strong understanding of the nuclear atom 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 guidePractice questions

What you'll learn in Topic 1.2

  • 1.2.1 Subatomic particles and the nuclear atom
  • 1.2.2 Isotopes
  • 1.2.3 Relative atomic mass and the mass spectrometer
Suggested study order: Read the notes for each sub-topic below → test yourself with flashcards → attempt practice questions → review exam technique.

Study resources — 1.2 The nuclear atom

1.2.1

Subatomic particles and the nuclear atom

Notes
1.2.2

Isotopes

Notes
1.2.3

Relative atomic mass and the mass spectrometer

Notes

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Topic 1.2 The nuclear atom forms a core part of Unit 1: Structure 1: Models of the particulate nature 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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