O-LevelChemistryAtomic Structure5070/12 · Oct/Nov 2019 · Q231 Mark

Helium and xenon are both noble gases. What is true of both elements?

Athey are chemically inert: ✓, the atoms have eight electrons in their outer shell: ✓

Bthey are chemically inert: ✓, the atoms have eight electrons in their outer shell: X

Cthey are chemically inert: X, the atoms have eight electrons in their outer shell: ✓

Dthey are chemically inert: X, the atoms have eight electrons in their outer shell: X

✓ Correct answer

B: they are chemically inert: ✓, the atoms have eight electrons in their outer shell: X

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Topic: Atomic Structure, O-Level Chemistry (syllabus 5070). Multiple choice, 1 mark.
Source: O-Level Chemistry, Oct/Nov 2019 Paper 1 Variant 2, question 23.

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