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The Periodic Table


  • 1) The image below shows Mendeleev’s periodic table. What did Mendeleev do to improve the early periodic table where elements were placed in inappropriate groups by strict order of atomic weight? 2 Marks



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  • 2) Use your periodic table on your Data Sheet to help you answer the rest of these questions. What are the horizontal rows on the periodic table called? 1 Marks


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  • 3) Elements in the same group of the periodic table have similar properties. Explain why 2 Marks


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  • 4) Lithium, sodium and potassium are in group 1 of the Periodic Table. Give two properties which show that they should be in the same group. 2 Marks


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  • 5) On the periodic table, sodium appears as 1123𝑁𝑎 2311Na. What does this tell us about the number of electrons sodium has, and the number of neutrons? 2 Marks


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  • 6) Group 1 elements react vigorously with chlorine. State the product formed when sodium reacts with chlorine, and how it appears at room temperature. 2 Marks


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  • 7) Describe and explain the trend in the reactivity of the halogens (group 7). 4 Marks


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