DP Chemistry (first assessment 2025)

Question 19M.2.SL.TZ2.a

Date	May 2019	Marks available	[Maximum mark: 1]	Reference code	19M.2.SL.TZ2.a
Level	SL	Paper	2	Time zone	TZ2
Command term	State	Question number	a	Adapted from	N/A

[Maximum mark: 1]

19M.2.SL.TZ2.a

The stable isotope of rhenium contains 110 neutrons.

State the nuclear symbol notation ${}_{\text{Z}}^{\text{A}}{\text{X}}$ for this isotope.

[1]

Markscheme

${}_{{\text{75}}}^{{\text{185}}}{\text{Re}}$ [✔]

Examiners report

It was expected that this question would be answered correctly by all HL candidates. However, many confused the A-Z positions or calculated very unusual numbers for A, sometimes even with decimals.

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.

Question 19M.2.SL.TZ2.a

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