CIE Jun 2014 v2 Paper 2 Q3

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The elements in Period 3 of the Periodic Table show variations in their behaviour across the period. (a) The bar chart below shows the variation of melting points of the elements across Period 3. PMT melting point / K 1800 1600 1400 1200 1000 800 600 400 200 0 Na Mg Al Si Cl Ar In each of the following parts of this question you should clearly identify the interactions involved and, where appropriate, explain their relative magnitudes. (i) Explain the general increase in melting point from Na to Al.[3] (ii) Explain the variation of melting points from P to Ar.[3] (iii) Explain why Si has a much higher melting point than any of the other elements in the period.[1]UCLES 2014 9701/22/M/J/14 [Turn over<br /> (b) The graph below shows the variation of therst ionisation energies across Period 3. PMT first ionisation energy / kJ mol1 1600 1400 1200 1000 800 600 400 200 Na Mg Al Si Cl Ar (i) Explain why therst ionisation energy of Ar is greater than that of Cl.[1] (ii) Explain why therst ionisation energy of Al is less than that of Mg.[1] (iii) Explain why therst ionisation energy of S is less than that of P.[1] [Total: 10]UCLES 2014 9701/22/M/J/14<br />

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