| Date | November 2012 | Marks available | 1 | Reference code | 12N.1.sl.TZ0.5 |
| Level | SL | Paper | 1 | Time zone | TZ0 |
| Command term | Question number | 5 | Adapted from | N/A |
Question
What is the correct number of each particle in an oxygen ion, \(^{{\text{18}}}{{\text{O}}^{2 - }}\)?
Markscheme
D
Examiners report
Two respondents commented on “oxygen ion” rather than “oxide ion”. The former was chosen when the paper was set to draw attention to the particular nature of the isotope in question.
Syllabus sections
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