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1 markPeriod 3: Sodium to Argon

CAPE Chemistry Unit 1 · 2012 · Paper 2 · Question 6(a)(i)

The elements sodium to argon (Period 3) are often used to illustrate periodic trends.

State the general trend in atomic radii in moving from left to right across Period 3 (from sodium to argon).

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Other parts of this question

  1. 6(a)(ii)Give a reason for the trend stated in (i) above.[1 mark]
  2. 6(b)(i)Which structure is exhibited by Magnesium?[3 marks]
  3. 6(b)(ii)Which structure is exhibited by Silicon?[3 marks]
  4. 6(b)(iii)Which structure is exhibited by Sulphur?[3 marks]
  5. 6(c)With reference to structure and bonding, account for the variation in melting points shown in the figure.[3 marks]
  6. 6(d)(i)Sketch a similar diagram to Figure 2 given in 6 (c) to illustrate the variation in the electrical conductivity of the elements in Period 3.[2 marks]
  7. 6(d)(ii)With reference to structure, explain the variations shown on your sketch in (d) (i) above.[3 marks]
  8. 6(e)(i)Describe the reaction which occurs when magnesium is heated in dry chlorine gas.[1 mark]
  9. 6(e)(ii)Write an equation to represent the reaction in (e)(i) above.[1 mark]

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