| Date | May 2017 | Marks available | 1 | Reference code | 17M.1.hl.TZ1.5 |
| Level | HL | Paper | 1 | Time zone | TZ1 |
| Command term | Apply | Question number | 5 | Adapted from | N/A |
Question
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.
Markscheme
B
Examiners report
[N/A]
