A-LevelChemistryAtomic structure9701/12 · Feb/Mar 2022 · Q21 Mark

What is the electronic configuration of Mg²⁺?

A1s² 2s² 2p⁶

B1s² 2s² 2p⁶ 3s²

C1s² 2s² 2p⁶ 3s² 3p²

D1s² 2s² 2p⁶ 3s² 3p⁶ 3d² 4s²

✓ Correct answer

A: 1s² 2s² 2p⁶

Oracle Prep sorts past-paper questions by topic, so you can drill Atomic structure and see which topics are most likely to come up next.

Topic: Atomic structure, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2022 Paper 1 Variant 2, question 2.

Questions and mark schemes are from past examination papers and remain the copyright of the exam board. How Oracle Prep builds its content

Which process has the largest enthalpy change per mole?

This question refers to isolated gaseous species. The species F⁻, Ne and Na⁺ are isoelectronic. This means they have …

An ion with a charge of 2- contains 10 electrons and 14 neutrons. What is its nucleon number?

How many moles of oxygen gas are needed for the complete combustion of 1 mol of (CH₃)₃COH?

In which pair will each compound give a different visible result with alkaline I₂(aq)?

Which reagent gives a positive result with propanone?