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Physics · May / June 2018 · Paper 11 · Question 40

5054The nucleus

A radioactive nucleus is represented as $^{230}_{92}\text{U}$. Which row represents another isotope of the same element?

  1. A90 protons, 140 neutrons
  2. B91 protons, 138 neutrons
  3. C92 protons, 139 neutrons
  4. D93 protons, 136 neutrons

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Correct answer: C. 92 protons, 139 neutrons

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