Edexcel Jun 2013 Paper 1 Q18

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SECTION B Answer ALL the questions. Write your answers in the spaces provided. 18 The radioactive isotope iodine-131, 131 53I, is formed in nuclear reactors providing nuclear power. Naturally occurring iodine contains only the isotope, 127 53I. (a) Complete the table to show the number of protons and neutrons in these two isotopes. Isotope Number of protons Number of neutrons 131 53I 127 53I (b) When iodine-131 decays, one of its neutrons emits an electron and forms a proton. Identify the new element formed by name or symbol. (2) (1)(c) The problem with radioactive iodine is that it accumulates in humans in the thyroid gland. Its absorption can be reduced by taking an appropriate daily dose of a soluble iodine compound. Suggest a suitable iodine compound which could be used. (1)(d) Nuclear power stations are often proposed as suitable alternatives to those burning coal, gas or oil. Suggest a country where, because of its location, the dangers of nuclear power may outweigh the advantages. Justify your answer. (1)(Total for Question 18 = 5 marks) *P41649A0924* Turn over<br />

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