A-LevelChemistryChemical periodicity9701/12 · May/June 2014 · Q101 Mark
Shown on the graph are the relative values of the first ionisation energies of four elements that have consecutive atomic numbers. One of the elements reacts with hydrogen to form a covalent compound with formula HX. Which element could be X? [Figure 10.1]
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✓ Correct answer
A: A
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