OCR A Jun 2012 Paper 1 Q2

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2 Chemists can use the Periodic Table to predict the behaviour of elements. (a) What is the name of the term used to describe the repeating patterns in the Periodic Table?[1] (b) Melting points show a trend across a period. The table below shows the melting points of three elements in Period 3 of the Periodic Table. element aluminium silicon phosphorus melting point / C 660 1410 44 Explain the trend shown in terms of bonding and structure. In your answer, you should use appropriate technical terms spelled correctly.[6]OCR 2012<br />
 (c) Scientists use sketch graphs to show trends. (i) Draw a sketch graph to show the general trend in ionisation energy across Period 3. ionisation energy Na Mg Al Si Cl Ar [1] (ii) Draw a sketch graph to show the general trend in atomic radius across Period 3. atomic radius Na Mg Al Si Cl Ar [1] [Total: 9]OCR 2012 Turn over<br />

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