CAIE A Level Chemistry 9701 · The Periodic Table: chemical periodicity
Silicon has a melting point of 1414 °C. Describe how the melting point and electrical conductivity of the period 3 elements vary from sodium to argon, and explain silicon's high melting point in terms of its structure and bonding.
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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