Edexcel Jan 2014 (IAL) Paper 1 Q17

Answers available below

Answer ALL the questions. Write your answers in the spaces provided. SECTION B 17 This question is about some of the elements in Period 3 of the Periodic Table. (a) (i) An atom of silicon has mass number 29. Complete the table below showing the numbers of sub-atomic particles in this atom of silicon. Use the Periodic Table as a source of data. Sub-atomic particles present in one atom of 29Si Number protons electrons neutrons (ii) Complete the electronic configuration of silicon. (1) (1) 1s2*(b) Explain the following, referring to differences in structure and bonding. (i) Silicon has a higher melting temperature than phosphorus. (3)(ii) Magnesium has a higher melting temperature than sodium. (2)*P42986A0924* Turn over<br /> (c) Suggest why the atomic radius decreases going across the Periodic Table from sodium to silicon. (2)(d) At room temperature, silicon tetrachloride, SiCl4, is a liquid that does not conduct electricity. Draw a dot and cross diagram illustrating the bonding in silicon chloride. Show only the outer electron shells of the atoms. Use crosses to represent the electrons from silicon and dots to represent the electrons from chlorine. (2) 10 *P42986A01024*<br /> (e) The diagram below shows the values of the first ionization energies of sodium and magnesium. First ionization energy / kJ mol1 1200 1000 800 600 400 200 Na Mg Al Si (i) On the diagram, add crosses to mark the approximate positions for the values of the first ionization energies of the elements Al and Si. *(ii) Justify your suggested values in terms of the atomic structure and electronic configuration of the elements. (1) (2) AluminiumSilicon(Total for Question 17 = 14 marks) *P42986A01124* 11 Turn over<br />

Show answer