Arrangement of elements
Cambridge IGCSE Chemistry (0620) · Unit 8: The Periodic Table · 7 flashcards
Arrangement of elements is topic 8.1 in the Cambridge IGCSE Chemistry (0620) syllabus , positioned in Unit 8 — The Periodic Table , alongside Group I - Alkali metals, Group VII - Halogens and Group VIII - Noble gases. In one line: Elements are arranged in periods (rows) and groups (columns) in order of increasing proton number/atomic number. Elements in the same group have similar chemical properties.
This topic is examined in Paper 1 (multiple-choice) and Papers 3/4 (theory), plus Paper 5 or Paper 6 (practical / alternative to practical). Past papers from 2022 to 2025 show this topic across undefined questions worth 73 marks (around 1.1% of all Chemistry marks in those years).
The deck below contains 7 flashcards — 1 definition, 4 key concepts and 2 identification cards — covering the precise wording mark schemes reward. Use the definition card to lock down command-word answers (define, state), then move on to the concept and application cards to handle explain, describe and compare questions.
How are elements arranged in the Periodic Table
Elements are arranged in periods (rows) and groups (columns) in order of increasing proton number/atomic number. Elements in the same group have similar chemical properties.
What the Cambridge 0620 syllabus says
2026-2028 syllabus, in our wordsWhat the syllabus expects you to be able to do in this topic, in plain English. Match the command word (Describe, Explain, State, etc.) in your answer to score full marks. For the exact wording, see the official syllabus (PDF).
- Describe Describe the Periodic Table as elements set out in periods and groups, arranged so that proton number (atomic number) goes up in order.
- Describe Describe how, going across a period, elements become less metallic and more non-metallic in character.
- Describe Describe how the group number of an element is linked to the charge on the ions it forms.
- Explain Explain why elements within one group have similar chemical properties, using their electronic configurations.
- Explain Explain how you can predict an element's properties from where it sits in the Periodic Table.
- Identify Identify trends within a group when you are given information about its elements. Supplement
How are elements arranged in the Periodic Table?
Elements are arranged in periods (rows) and groups (columns) in order of increasing proton number/atomic number. Elements in the same group have similar chemical properties.
What is the general trend in metallic character across a period?
The metallic character decreases across a period. Elements on the left side of the periodic table are more metallic than the ones on the right side.
What is the relationship between group number and the charge of ions formed?
The group number often indicates the charge of the ions formed from elements in that group.
Why do elements in the same group have similar chemical properties?
Elements in the same group have the same number of valence electrons (outer shell electrons). This leads to similar chemical reactions and properties due to similar electronic configurations.
How can the position of an element in the Periodic Table be used to predict its properties?
The position indicates metallic/non-metallic character and reactivity.
Give an example of a Group 7 element at room temperature.
Fluorine (F₂) is a gas, Bromine is a red-brown liquid, and Iodine is a solid. Astatine (At) is also in group 7.
What is used to test for the presence of water?
Anhydrous copper(II) sulfate or cobalt chloride paper can be used to test for water. Anhydrous copper(II) sulfate changes from white to blue in the presence of water: CuSO₄(s) + 5H₂O(l) → CuSO₄·5H₂O(s). Cobalt chloride paper changes from blue to pink.
Key Questions: Arrangement of elements
How are elements arranged in the Periodic Table?
Elements are arranged in periods (rows) and groups (columns) in order of increasing proton number/atomic number. Elements in the same group have similar chemical properties.
Tips to avoid common mistakes in Arrangement of elements
- ● When a question asks for an element, a compound, or an ion, double-check you've given that specific type of substance.
- ● Memorise the common physical properties (state, colour) of the elements in the Periodic Table.
- ● For composition comparisons, name specific elements, not just general trends.
More topics in Unit 8 — The Periodic Table
Arrangement of elements sits alongside these Chemistry decks in the same syllabus unit. Each uses the same spaced-repetition system, so progress in one informs the next.
Cambridge syllabus keywords to use in your answers
These are the official Cambridge 0620 terms tagged to this section. Mark schemes credit responses that use the exact term — weave them into your answers verbatim rather than paraphrasing.
Key terms covered in this Arrangement of elements deck
Every term below is defined in the flashcards above. Use the list as a quick recall test before your exam — if you can't define one of these in your own words, flip back to that card.
Related Chemistry guides
Long-read articles that go beyond the deck — cover the whole subject's common mistakes, high-yield content and revision pacing.
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