Learning objective
Explain the trend in atomic radius across Period 3.
Read the explanation, check the common trap, then practise with flashcards and questions.
At a glance
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Flashcards
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Questions
Topic
Periodicity
Subtopic
Physical properties of Period 3 elements
Study support
Understand this objective
Quick explanation
Explain the trend in atomic radius across Period 3
- This point belongs to Periodicity, especially Physical properties of Period 3 elements.
- You need to be able to explain the trend in atomic radius across Period 3.
- The key ideas to know are Period 3 and atomic radius.
- Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.
Key concepts
Why it matters
This objective helps connect Physical properties of Period 3 elements to exam-style questions, flashcards, and revision notes for Periodicity.
Quick student answer
Which of the following statements correctly describes the trend in atomic radius across Period 3 from sodium (Na) to argon (Ar)?
Direct answer
B) Atomic radius decreases due to increased nuclear charge.
Key terms
- Atomic Radius: The distance from the nucleus of an atom to the outermost shell of electrons.
- Effective Nuclear Charge: The net positive charge experienced by an electron in a multi-electron atom, accounting for shielding by other electrons.
Common trap
Confusing atomic radius with ionic radius: Remember that ionic radii can differ significantly from atomic radii due to the loss or gain of electrons.
Related questions
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Flashcard prompts
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Revision tools
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Revision notestopic notes
Open the full topic revision notes when you are ready to review this objective in context.
Open revision notesRelated learning objectives
- Classify elements as s, p, d or f block from their position in the Periodic Table.
Classification
- Explain how proton number determines periodic table position.
Classification
- Link block classification to electron configuration.
Classification
- Explain the trend in first ionisation energy across Period 3.
Physical properties of Period 3 elements
- Explain melting point trends across Period 3 using structure and bonding.
Physical properties of Period 3 elements