OCR A Jun 2010 Paper 1 Q3

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In an atom the electrons occupy sub-shells in order of increasing energy. (a) Complete the table below to show the order in which the next two sub-shells are filled. 1s 2s 2p 3s 3p 4s increasing energy [1] (b) Sub-shells are made up of orbitals. (i) What is meant by an orbital ?[1] (ii) State the total number of electrons occupying the p orbitals in one chlorine atom. (c) How many electrons are there in one ion of Ca2+? answer =[1] answer =[1]OCR 2010<br /> (d) The successive ionisation energies of aluminium are shown in the table below. Some of these ionisations involve the removal of an electron from an s sub-shell. ionisation energy / kJ mol1 ionisation number 578 1817 2745 11 578 14 831 18 378 23 296 27 460 31 862 38 458 42 655 1st 2nd 3rd 4th 5th 6th 7th 8th 9th 10th 11th (i) State all the ionisation numbers that involve the removal of an electron from s sub-shells.[2] (ii) Write the equation that represents the third ionisation energy of Al. Include state symbols.[2] [Total: 8]OCR 2010 Turn over<br />

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