CAIE A Level Chemistry 9701 · The Periodic Table: chemical periodicity
An unknown element X is a solid at room temperature. A sample of X conducts electricity when solid, but when X is melted, the liquid also conducts electricity. X does not react with water.
Describe what these observations suggest about the nature of X, its possible position in the Periodic Table, and its identity.
5 marks, so the mark scheme is looking for about 5 separate creditworthy points. Making the same point twice in different words earns it once.
Describe means: Say what happens or what something is like, in order and with detail. You are not being asked why. If there is data, quote it: name the trend, then give figures with units at the points where it changes.
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