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2 marksPeriodic Table and Periodicity

CSEC Chemistry · May/June 2010 · Paper 2 · Question 2(a)(i)

The following statements were taken from a student's notebook. These statements are INCORRECT. In each case, you should state why the statement is incorrect and give the correct statement.

Sodium, magnesium, aluminium, silicon and chlorine are found in the same group in the periodic table. (Give your answer in terms of electron configuration.)

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Other parts of this question

  1. 2(a)(ii)Of the elements magnesium and copper, magnesium will more readily oxidize an aqueous solution of zinc ions than copper will.[4 marks]
  2. 2(b)(i)P reacts with water to produce a solution of its hydroxide and hydrogen gas. Write a balanced equation for the reaction between P and water.[2 marks]
  3. 2(b)(ii)Both P and Q give similar products when reacted with water. Account for this observation.[2 marks]
  4. 2(b)(iii)Q is radioactive. Radioactive substances are widely used in medicine, agriculture and industry. What is meant by the term 'radioactive'?[1 mark]
  5. 2(b)(iv)Give TWO uses of radioactive elements in medicine, agriculture or industry.[2 marks]
  6. 2(c)Using dot-and-cross diagrams, show the bonding between Q and oxygen. [¹⁶₈O][2 marks]

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