CAIE A Level Chemistry 9701 · The Periodic Table: chemical periodicity
With reference to the elements in Period 3, describe the periodicity in atomic radius, ionic radius, melting point and electrical conductivity. Explain the variations in melting point and electrical conductivity in terms of the structure and bonding of the elements.
7 marks, so the mark scheme is looking for about 7 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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