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S3.1 Trends in Atomic and Ionic Radius (IBDP Chemistry)

S3.1 Trends in Atomic and Ionic Radius (IBDP Chemistry)

Subject: Chemistry

Age range: 16+

Resource type: Lesson (complete)

Last updated

12 May 2026

pptx, 2.51 MB
pptx, 2.51 MB

This PowerPoint lesson explains the trends in atomic and ionic radius, helping IBDP Chemistry students understand periodicity through effective nuclear charge and electron shielding. Designed for first assessment 2025, it develops the conceptual depth required to confidently explain and compare atomic and ionic sizes in exam-style questions.

Atomic radius is defined as half the distance between the nuclei of two identical atoms joined by a covalent bond, since the edge of an atom cannot be measured directly in the quantum model. This lesson carefully builds this definition and introduces the concept of effective nuclear charge (Zâ‚‘ff), explaining how shielding by inner electrons reduces the full nuclear attraction felt by valence electrons.

Students are guided through the periodic trends: atomic radius increases down a group due to additional electron shells and increased shielding, and decreases across a period due to increasing nuclear charge within the same principal energy level. Deviations and measurement differences (covalent vs van der Waals radii) are clearly addressed to strengthen exam accuracy.

The lesson then extends to ionic radii, comparing cations and anions with their parent atoms and explaining size changes in terms of electron–electron repulsion and nuclear attraction. A major focus is placed on isoelectronic species, where students compare ions with the same number of electrons and determine size based on proton number.

Structured explanations, worked examples, periodic table references, and clear summary slides support understanding. Starter activities and practice questions are included for consolidation or assessment.

This resource is suitable for SL and HL students and supports teaching of periodicity in Topic 3.

File type included: PowerPoint (.pptx)
Last updated: January 2026 – explanations refined, isoelectronic comparisons clarified, and content checked against the 2025 IB Chemistry syllabus.

Get this resource as part of a bundle and save up to 33%

A bundle is a package of resources grouped together to teach a particular topic, or a series of lessons, in one place.

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BUNDLE S3 Classification of Matter, SL Content Only (IBDP Chemistry)

This bundle of PowerPoints covers the SL content of S3 Classification of Matter for IBDP Chemistry (first examination 2025), bringing together key ideas from the periodic table and introductory organic chemistry in one structured resource. It is designed to help students classify substances based on their structure, composition and properties, while building the knowledge needed for later topics in bonding, reactivity and analysis. In IBDP Chemistry, classification of matter involves organising elements and compounds into meaningful groups so that patterns in their behaviour can be understood and predicted. This bundle supports that aim through two major sections. S3.1 develops student understanding of the periodic table, including its structure, electron arrangement, atomic and ionic radius, periodic trends, Group 1 and Group 17 elements, the metallic and non-metallic continuum, and oxidation states. S3.2 then introduces the classification of organic compounds through types of formula, functional groups, homologous series, nomenclature of straight-chain and branched-chain compounds, and structural isomerism. This fully editable bundle includes 13 PowerPoint (.pptx) lessons: S3.1 Structure of the Periodic Table, Electrons and the Periodic Table, Trends in Atomic and Ionic Radius, Periodicity of Ionisation Energy/Electron Affinity/Electronegativity, Group 1 and 17 Elements, Metallic and Non-Metallic Continuum, and Oxidation States. S3.2 Types of Formula, Functional Groups, Homologous Series, Nomenclature of Straight-Chain Organic Compounds, Nomenclature of Branched-Chain Organic Compounds, and Structural Isomerism. Across the bundle, students are supported with retrieval starters, key word definitions, clear explanations, worked examples and practice questions with answers. These lessons are ideal for first teaching, revision, cover lessons or building a complete SL unit sequence aligned to the IBDP Chemistry specification for first examination 2025. File types included: editable PowerPoint (.pptx) files. Last updated: 2026 – improved sequencing, refined explanations, and enhanced practice activities across both periodicity and organic classification content.

£17.00
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BUNDLE S3.1 The Periodic Table: Classification of Elements, SL & HL (IBDP Chemistry)

This comprehensive PowerPoint bundle covers IBDP Chemistry S3.1 Periodic Table: classification of elements (SL & HL), including structure, periodic trends and transition elements. It provides a complete sequence of lessons designed to build deep understanding of how elements are organised and how their properties change across the periodic table. The periodic table is a systematic arrangement of elements by increasing atomic number, where patterns in physical and chemical properties repeat (periodicity). This bundle supports students in recognising these patterns and using them to explain trends in atomic structure, reactivity and bonding. Students develop understanding of metals, non-metals and metalloids, electron configurations, and key periodic trends such as ionisation energy, electronegativity and electron affinity . This bundle includes 11 fully editable PowerPoint (.pptx) lessons: • Structure of the periodic table • Electrons and the periodic table • Trends in atomic and ionic radius • Periodicity: ionisation energy, electron affinity and electronegativity • Group 1 and Group 17 elements • Metallic and non-metallic continuum • Oxidation states • HL: discontinuities in ionisation energy • HL: characteristic properties of transition elements • HL: variable oxidation states in transition elements • HL: coloured complexes of transition elements Each lesson includes retrieval starters, clear explanations, key definitions, worked examples and exam-style practice questions with answers. This resource is ideal for full topic delivery, revision, or structured lesson planning aligned to the IBDP Chemistry 2025 specification. File types included: • Editable PowerPoint (.pptx) lessons Last updated: 2026 – improved explanations of periodic trends and enhanced exam-style practice questions.

£14.30
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BUNDLE S3.1 The Periodic Table: Classification of Elements, SL Content (IBDP Chemistry)

This bundle of PowerPoints covers IBDP Chemistry SL Topic 3.1: The Periodic Table – Classification of Elements (first examination 2025) and provides a complete, structured teaching sequence aligned to the updated IB specification. It is designed to build deep conceptual understanding of periodic trends, classification and electron configuration, while preparing students for exam-style explanations. Topic 3.1 focuses on how elements are classified in the periodic table and how their position explains their properties. The periodic table is arranged by increasing atomic number and organised into groups, periods and blocks (s, p, d, f). In this bundle, students explore metals, non-metals and metalloids, group and period relationships, valence electron patterns, periodic trends in atomic radius, ionisation energy, electron affinity and electronegativity, as well as metallic and non-metallic character. The bundle includes the following fully editable .pptx PowerPoint files: • Structure of the Periodic Table • Electrons and the Periodic Table • Trends in Atomic and Ionic Radius • Periodicity of Ionisation Energy, Electron Affinity and Electronegativity • Group 1 and 17 Elements • Metallic and Non-Metallic Continuum • Oxidation States Each lesson contains retrieval starters, clearly defined key terms, worked examples, explanations linked to effective nuclear charge and shielding, mini whiteboard practice, and exam-style questions with answers. The sequence progresses logically from classification and electron configuration to periodic trends and reactivity (Group 1 metals and halogens), before linking structure to acid–base behaviour of Period 3 oxides and environmental chemistry (acid rain and ocean acidification). Oxidation states are included to support understanding of redox and naming conventions. This bundle is ideal for full-topic teaching, consolidation or structured revision of SL 3.1 and supports conceptual understanding, IB Nature of Science links and strong explanation skills required for IB assessment.

£9.00

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