IB Chemistry HL 3.1.7 Ionisation-Energy Discontinuities Question Bank
Interpret successive-ionisation-energy jumps to infer shells, groups and electron arrangements.
- Syllabus
- First assessment 2025
- Course
- Chemistry HL
- Level
- HL
Exam points
- explain ionization-energy discontinuities by identifying the subshell receiving the next electron
- use nuclear charge, subshell energy and shielding to explain Be→B and similar drops
- explain a pairing anomaly through electron–electron repulsion within a filled or half-filled subshell
3.1.7 (HL)—IE discontinuities question 1
Which statement explains one of the decreases in first ionization energy (I.E.) across period 3?
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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