DP Chemistry (first assessment 2025)
Question 21M.2.SL.TZ1.d(iv)
| Date | May 2021 | Marks available | [Maximum mark: 1] | Reference code | 21M.2.SL.TZ1.d(iv) |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Outline | Question number | d(iv) | Adapted from | N/A |
d(iv).
[Maximum mark: 1]
21M.2.SL.TZ1.d(iv)
Outline, in terms of their electronic structures, why the ionic radius of the sulfide ion is greater than that of the oxide ion.
[1]
Markscheme
«valence» electrons further from nucleus/extra electron shell/ electrons in third/3s/3p level «not second/2s/2p»✔
Accept 2,8 (for O2–) and 2,8,8 (for S2–)
Syllabus sections
Structure 2. Models of bonding and structure » Structure 2.1—The ionic model » Structure 2.1.1—When metal atoms lose electrons, they form positive ions called cations. When non-metal atoms gain electrons, they form negative ions called anions. Predict the charge of an ion from the electron configuration of the atom.