CAIE A Level Chemistry 9701 · The Periodic Table: chemical periodicity
Silicon and sulfur are elements in Period 3. Their melting points and electrical conductivities are very different.
Explain the differences in melting point and electrical conductivity between silicon and sulfur in terms of their structure and bonding.
4 marks, so the mark scheme is looking for about 4 separate creditworthy points. Making the same point twice in different words earns it once.
Explain means: Give the reasons or the mechanism: why or how something happens. Link each point to the next with because, so or which means. A list of facts with no links usually loses the reasoning marks.
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