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CAIE A-Level Chemistry AS 1.4.5 Ionisation Energies Are Due to the Attraction Questions

Practise explaining ionisation energies by linking nuclear attraction to proton number, electron distance and shielding for atoms across the Periodic Table.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • Explain ionisation energies as the attraction between the nucleus and the outer electron, using nuclear charge, distance and shielding.

CAIE A-Level Chemistry AS 1.4.5 Ionisation Energies Are Due to the Attraction Questions question 1

[Maximum number: 1]

The graph shows the variation of the first ionisation energy with proton number for some elements. The letters used are not the actual symbols for the elements.

Figure for Question CAIE A-Level Chemistry AS 1.4.5 Ionisation Energies Are Due to the Attraction Questions question 1 — CAIE A-Level Chemistry AS

Which statement about the elements is correct?

A

P and X are in the same period in the Periodic Table.

B

The general increase from Q to X is due to increasing atomic radius.

C

The small decrease from R to S is due to decreased shielding.

D

The small decrease from U to V is due to repulsion between paired electrons.

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