A-LevelChemistryChemical periodicity9701/12 · May/June 2019 · Q31 Mark

The first eight successive ionisation energies for two elements of Period 3 of the Periodic Table are shown in the graphs. [Figure 3.1] What is the formula of the ionic compound formed from these elements?

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AMgCl2

BCaBr2

CNa2S

DK₂Se

✓ Correct answer

A: MgCl2

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Topic: Chemical periodicity, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2019 Paper 1 Variant 2, question 3.

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