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IB Chemistry HL 3.1.7 Hl Ie Discontinuities Questions

Use real exam questions to locate ionization-energy jumps, connect them to occupied sublevels or electron pairing, and justify electron arrangements.

Syllabus
First assessment 2025
Course
Chemistry HL
Level
HL

Exam points

  • Identify an ionization-energy discontinuity or graph drop and locate the change in occupied main energy level or sublevel.
  • Explain a discontinuity using sublevel energy, shielding and electron-pair repulsion, including the Be/B or P/S exceptions.
  • Interpret successive-ionization-energy data to justify an electron arrangement or the number of electrons removed before a large jump.

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Study 3.1.7 (HL)—IE discontinuities conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Chemistry HL 3.1.7 Hl Ie Discontinuities Questions question 1

[Maximum number: 1]

Which statement explains one of the decreases in first ionization energy (I.E.) across period 3?

Figure for Question IB Chemistry HL 3.1.7 Hl Ie Discontinuities Questions question 1 — IB Chemistry HL
A

The nuclear charge of element Al is greater than element Mg .

B

The electron-electron repulsion is greater, for the electron with the opposite spin, in element S than in element P.

C

A new sub-level is being filled at element S .

D

The p orbital being filled in element Al is at a lower energy than the s orbital in element Mg .

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