CAIE A Level Chemistry 9701 · The Periodic Table: chemical periodicity
The melting points of the elements sodium, magnesium, aluminium, silicon, phosphorus and sulfur are shown.
| element | melting point / K |
|---|---|
| sodium | 371 |
| magnesium | 922 |
| aluminium | 933 |
| silicon | 1687 |
| phosphorus | 317 |
| sulfur | 388 |
Describe and explain the variation in melting point across these 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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