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4 marksParticles in the Atom

CSEC Physics · May/June 2018 · Paper 2 · Question 2(a)(ii)

An atom consists of three types of particles: protons, neutrons and electrons.

For the element 226/88 Ra, determine the number of EACH of the three particles referred to in (a)(i).

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Other parts of this question

  1. 2(a)(i)Complete the following table to show the charge of EACH particle.[3 marks]
  2. 2(a)(iii)State ONE similarity and ONE difference between the isotopes of an element.[2 marks]
  3. 2(b)(i)Define the term 'half-life' of a radioactive substance.[2 marks]
  4. 2(b)(ii)The element thorium (Th) has a half-life of 24 days and undergoes beta-decay. Calculate the time it would take for 10 grams of thorium to decay to 1.25 grams.[4 marks]

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