A-LevelChemistryAtomic structure9701/12 · Feb/Mar 2024 · Q181 Mark

This question refers to isolated gaseous species. The species F⁻, Ne and Na⁺ are isoelectronic. This means they have the same number of electrons. In which order do their radii increase?

Asmallest: Na⁺, largest: F⁻, Ne

Bsmallest: F⁻, largest: Ne, Na⁺

Csmallest: Na⁺, largest: Ne, F⁻

Dsmallest: Ne, largest: F⁻, Na⁺

✓ Correct answer

C: smallest: Na⁺, largest: Ne, F⁻

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Topic: Atomic structure, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2024 Paper 1 Variant 2, question 18.

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