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1 markAtomic Structure

CSEC Chemistry · May/June 2010 · Paper 2 · Question 2(b)(iii)

P and Q both have an electron configuration of 2, 8, 1. The mass numbers of P and Q are 23 and 24 respectively.

Q is radioactive. Radioactive substances are widely used in medicine, agriculture and industry. What is meant by the term 'radioactive'?

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Other parts of this question

  1. 2(a)(i)Sodium, magnesium, aluminium, silicon and chlorine are found in the same group in the periodic table. (Give your answer in terms of electron configuration.)[2 marks]
  2. 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]
  3. 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]
  4. 2(b)(ii)Both P and Q give similar products when reacted with water. Account for this observation.[2 marks]
  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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