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4 marksParticles in the Atom

CSEC Physics · May/June 2019 · Paper 2 · Question 6(a)(ii)

Lithium-7 is an isotope of lithium. Its mass number is 7 and its atomic number is 3.

Draw a clearly labelled diagram of the structure of the lithium-7 atom.

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Other parts of this question

  1. 6(a)(i)Use the information given above to determine the number of protons and neutrons present in an atom of lithium-7.[2 marks]
  2. 6(b)(i)Define the term 'half-life'.[2 marks]
  3. 6(b)(ii)Calculate the half-life of lithium.[3 marks]
  4. 6(c)Calculate the energy given off in a nuclear reaction if the change in mass is 0.2014 u.[4 marks]

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