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Edexcel A-Level Chemistry AS 8.11 Reasons for the Trend in Ionisation Energy Down Groups 1 And 2 Questions

State the downward trend, then connect an extra occupied shell to greater radius and shielding, which weakens nuclear attraction despite increased proton number.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Explain decreasing first ionisation energy through greater radius and electron shielding.
  • Compare Group 1 or 2 elements by linking outer-shell attraction to ionisation energy.

Edexcel A-Level Chemistry AS 8.11 Reasons for the Trend in Ionisation Energy Down Groups 1 And 2 Questions question 1

[Maximum number: 1]

Going from calcium to barium in Group 2, which property changes as stated?

A

ionic radius decreases

B

first ionisation energy decreases

C

melting temperature increases

D

reactivity with water decreases

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