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Edexcel A-Level Chemistry AS 3.7 Reasons for the Trends in Ionic Radii Down a Group in the Periodic Table and for a Set of Isoelectronic Ions Questions

Check whether the ions are isoelectronic, then compare proton number and attraction; for group trends, compare occupied shells before reading or plotting radius data.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Order isoelectronic ions by increasing proton number and decreasing ionic radius.
  • Explain larger radii down a group through additional occupied electron shells.
  • Estimate an ionic radius from a table or straight line of best fit with units.

Edexcel A-Level Chemistry AS 3.7 Reasons for the Trends in Ionic Radii Down a Group in the Periodic Table and for a Set of Isoelectronic Ions Questions question 1

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Table for Question Edexcel A-Level Chemistry AS 3.7 Reasons for the Trends in Ionic Radii Down a Group in the Periodic Table and for a Set of Isoelectronic Ions Questions question 1 — Edexcel A-Level Chemistry AS

Explain the trend in the ionic radii from the nitride ion to the aluminium ion.

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