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CAIE A-Level Chemistry 1.4.5 Nuclear Attraction and Ionisation Energy

Practise relating ionisation energy to electrostatic attraction between the positive nucleus and the electron removed.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • link higher nuclear charge to stronger attraction for an electron at comparable distance and shielding
  • link greater distance or shielding to weaker attraction and lower ionisation energy
  • explain successive increases through smaller ionic radius and reduced electron–electron shielding or repulsion

1.4.5—Ionisation energies are due to the attraction question 1

[Maximum number: 1]

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

Figure for Question 1.4.5—Ionisation energies are due to the attraction 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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