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2 marksStructure of the Atom

CSEC Physics · January 2014 · Paper 2 · Question 6(a)(ii)

A nucleus of a radioactive isotope radium ²²⁶₈₆Ra emits an α-particle (alpha-particle) when it decays to a nucleus of the element radon, Rn.

How many neutrons are in the ²²⁶₈₆Ra nucleus?

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Other parts of this question

  1. 6(a)(i)Write the equation representing this decay process.[3 marks]
  2. 6(b)Explain why an atom is normally neutral and stable.[4 marks]
  3. 6(c)What are 'isotopes'?[2 marks]
  4. 6(d)(i)State the mass number, atomic number and the charge on the nucleus of this atom.[4 marks]
  5. 6(d)(ii)Write the symbol for another possible isotope of X.[1 mark]

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