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A Simple Model of the Atom, Symbols, Relative Atomic Mass, Electronic Change and Isotopes


  • 1) The diagram below shows an atom of chlorine. Give the mass number of chlorine. 1 Marks



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  • 2) What is the total number of protons in an atom called? 1 Marks


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  • 3) An atom of chlorine has no overall charge. Explain why by referring to sub-atomic particles 2 Marks


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  • 4) Fluorine is in the same group of the periodic table as chlorine. Explain why by referring to their electronic structures 2 Marks


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  • 5) The nuclear model of the atom was adapted from the plum pudding model based on alpha particle scattering experiments. Explain how the findings of the experiments altered the model. 3 Marks


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  • 6) Chlorine can react with calcium to form calcium chloride (CaCl2). How many elements are in this compound? 1 Marks


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  • 7) Calcium chloride is a solid but can be found in a mixture with other liquids. Explain a method to separate the solid calcium chloride from the rest of the mixture 3 Marks


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