DP Chemistry (first assessment 2025)

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Question 21M.1A.SL.TZ1.7

Date	May 2021	Marks available	[Maximum mark: 1]	Reference code	21M.1A.SL.TZ1.7
Level	SL	Paper	1A	Time zone	TZ1
Command term	Deduce	Question number	7	Adapted from	N/A

7.

[Maximum mark: 1]

21M.1A.SL.TZ1.7

Which species has the same electron configuration as argon?

A. Br⁻

B. Ca²⁺

C. Al³⁺

D. Si⁴⁺

[1]

Markscheme

B

Syllabus sections

Structure 3. Classification of matter » Structure 3.1—The periodic table: Classification of elements » Structure 3.1.2—The period number shows the outer energy level that is occupied by electrons. Elements in a group have a common number of valence electrons. Deduce the electron configuration of an atom up to Z = 36 from the element’s position in the periodic table and vice versa.