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CAIE A-Level Chemistry AS 1.4.3 The Trends in Ionisation Energies Across Questions

Practise identifying and explaining ionisation-energy trends across periods and down groups, using nuclear charge, shielding, atomic radius and subshell effects.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Identify and explain trends in first ionisation energies across periods and down groups, including deviations from general patterns.

CAIE A-Level Chemistry AS 1.4.3 The Trends in Ionisation Energies Across Questions question 1

[Maximum number: 1]

This question is about the first ionisation energies of magnesium and neon.
Which row is correct?

first ionisation energy

from Mg

from Ne

Mg>Ne\mathrm{Mg}>\mathrm{Ne}

p

s

Mg>Ne\mathrm{Mg}>\mathrm{Ne}

s

p

Ne>Mg\mathrm{Ne}>\mathrm{Mg}

p

s

Ne>Mg\mathrm{Ne}>\mathrm{Mg}

S

p

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