DP Chemistry (first assessment 2025)
Question 22N.1A.SL.TZ0.5
| Date | November 2022 | Marks available | [Maximum mark: 1] | Reference code | 22N.1A.SL.TZ0.5 |
| Level | SL | Paper | 1A | Time zone | TZ0 |
| Command term | Deduce | Question number | 5 | Adapted from | N/A |
5.
[Maximum mark: 1]
22N.1A.SL.TZ0.5
Which quantities are different between two species represented by the notation and −?
A. The number of protons only
B. The number of protons and electrons only
C. The number of protons and neutrons only
D. The number of protons, neutrons and electrons
[1]
Markscheme
D
Examiners report
A well answered question. 62% of the candidates compared the numbers of protons, neutrons and electrons in the two species correctly.
Syllabus sections
Structure 1. Models of the particulate nature of matter » Structure 1.2—The nuclear atom » Structure 1.2.1 - Atoms and negatively charged electrons. Atoms contain a positively charged, dense nucleus composed of protons and neutrons (nucleons). Negatively charged electrons occupy the space outside the nucleus. Use the nuclear symbol ZXA to deduce the number of protons, neutrons and electrons in atoms and ions.