| Date | November 2009 | Marks available | 1 | Reference code | 09N.1.SL.TZ0.22 |
| Level | Standard level | Paper | Paper 1 | Time zone | Time zone 0 |
| Command term | Question number | 22 | Adapted from | N/A |
Question
The relationship between proton number Z, neutron number N and nucleon number A is
A. A=Z−N.
B. Z=A+N.
C. N=A−Z.
D. N=A+Z.
Markscheme
C
Examiners report
[N/A]
Syllabus sections
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