OCR A Jun 2011 Paper 1 Q1

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Answer all the questions. This question is about a model of the structure of the atom. (a) A model used by chemists includes the relative charges, the relative masses and the distribution of the sub-atomic particles making up the atom. Complete the table below. particle proton neutron electron relative charge relative mass position within the atom 1/2000 shell [1] (b) Early studies of ionisation energies helped scientists to develop a model for the electron structure of the atom. Define the term first ionisation energy.[3] (c) A modern model of the atom arranges electrons into orbitals, sub-shells and shells. Complete the following table showing the maximum number of electrons which can be found within each region. number of electrons region a 2p orbital the 3s sub-shell the 4th shell [3]OCR 2011<br />
 (d) The modern Periodic Table arranges the elements in order of their atomic number. When arranged in this order the elements show periodicity. Explain what is meant by the term periodicity.[1] (e) In this part, you need to refer to the Periodic Table of the Elements in the Data Sheet for Chemistry A. From the first 18 elements only, choose an element which fits the following descriptions. (i) An element with an isotope that can be represented as 14 6X.[1] (ii) The element which has the strongest metallic bonding in Period 3.[1] (iii) The element which forms a 3 ion with the same electron structure as Ne.[1] (iv) The element which has the smallest third ionisation energy.[1] (v) The element with the first six successive ionisation energies shown below, in kJ mol1. 738 1451 7733 10 541 13 629 17 995[1] [Total: 13]OCR 2011 Turn over<br />

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