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JAMB Chemistry 2004 Question 10

Question 10

Radioactivity

22688Ra → x86Rn + α – particle
What is the value of x in the nuclear reaction above?

  1. A.220
  2. B.222
  3. C.226
  4. D.227
Show the answer and explanation

Answer: B (222)

Explanation

An alpha particle is 42He, so the mass number falls by 4: 226 – 4 = 222.