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4 marksStructure and Bonding

CSEC Chemistry · May/June 2012 · Paper 2 · Question 4(b)(ii)

The properties of elements can be explained based on their electronic configuration and hence their position in the Periodic Table. The electronic configurations of four elements P, Q, R and S are: P: 2, 7; Q: 2, 8, 2; R: 2, 8, 6; S: 2, 8, 8, 2.

Elements P and Q react together to form a compound. Deduce whether this compound is ionic or covalent. Use 'dot cross' diagrams to show the bonding in the compound formed and write its formula.

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Other parts of this question

  1. 4(a)State TWO other uses of radioisotopes and explain the importance of EACH.[4 marks]
  2. 4(b)(i)Outline the criteria for placing elements in the Periodic Table. Hence, state the appropriate group and period for EACH of the elements P, Q, R and S.[4 marks]
  3. 4(b)(iii)Compare the reactivity of EACH of elements Q and S with dilute hydrochloric acid. Write a balanced equation for EITHER of these reactions with dilute…[3 marks]

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