OCR A Jan 2012 Paper 1 Q3

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The modern Periodic Table is arranged into blocks of elements based on their electron configuration. (a) We now know that electrons are in shells; shells have sub-shells and sub-shells have orbitals. (i) Explain what is meant by the term orbital.[1] (ii) Complete the electron configuration below, in terms of sub-shells, for an atom of sulfur. 1s2[1] (iii) How many full orbitals are in an atom of sulfur?[1] (b) One mole of sulfur atoms has a mass of 32.1 g. What is meant by one mole of substance?[1] (c) Ionisation energies provide evidence for the order of elements in the modern Periodic Table. Define the term first ionisation energy.[3]OCR 2012<br />
 (d) The first ionisation energies and atomic radii of F, Ne and Na are shown below. element first ionisation energy / kJ mol1 atomic radius / nm Ne Na 1681 2081 496 0.071 0.065 0.191 (i) Explain why there is an increase in first ionisation energy between F and Ne.[3] (ii) Explain why there is a decrease in first ionisation energy between Ne and Na.[3] [Total: 13]OCR 2012 Turn over<br />

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