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A-LevelChemistryChemical periodicity9701/12 · Feb/Mar 2025 · Q171 Mark

Q, R and S are consecutive elements in Period 3 of the Periodic Table. Element R has the highest first ionisation energy and the lowest melting point of these three elements. What are the identities of Q, R and S?

ANa Mg Al

BMg Al Si

CAl Si P

DSi P S

✓ Correct answer

D: Si P S

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About this question

Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2025 Paper 1 Variant 2, question 17.

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