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1 markAtomic Structure

CSEC Chemistry · January 2008 · Paper 2 · Question 2(a)(i)

Elements X and Y have electron configurations: X (2, 8, 2) and Y (2, 8, 8, 2).

What is the atomic number of Element Y?

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Other parts of this question

  1. 2(a)(ii)Place Elements X and Y in their correct positions on the periodic table in Figure 2.[2 marks]
  2. 2(a)(iii)Explain why you placed the Elements X and Y in the particular group and period in Figure 2 above.[3 marks]
  3. 2(a)(iv)Classify X and Y as metals or nonmetals. Give ONE reason for your answer.[2 marks]
  4. 2(b)Based on the position of X and Y in the periodic table, how will X and Y react with cold water? Give ONE reason for your answer. You should comment on the…[3 marks]
  5. 2(c)(i)Write a balanced chemical equation for the reaction between X and oxygen.[2 marks]
  6. 2(c)(ii)What type of bond will be formed when X combines with oxygen? Give a reason for your answer.[2 marks]

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