Learning objective
Explain the trend in first ionisation energy across Period 3.
Read the explanation, check the common trap, then practise with flashcards and questions.
At a glance
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Topic
Periodicity
Subtopic
Physical properties of Period 3 elements
Study support
Understand this objective
Quick explanation
Explain the trend in first ionisation energy 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 first ionisation energy across Period 3.
- The key ideas to know are Period 3 and first ionisation energy.
- 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 first ionisation energy across Period 3?
Direct answer
The first ionisation energy increases from sodium to argon.
Key terms
- Ionisation Energy: The energy required to remove one mole of electrons from one mole of gaseous atoms.
- Periodicity: The repeating pattern of chemical and physical properties of the elements across different periods in the periodic table.
Common trap
Confusing Ionisation Energy with Electronegativity: Ionisation energy refers to the energy needed to remove an electron, while electronegativity measures an atom's ability to attract electrons in a bond.
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Flashcard prompts
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Revision tools
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Revision notestopic notes
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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 atomic radius 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