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5.1 The nuclear model of the atom

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Question 183

One isotope of thorium is represented by the nuclide symbol 90234Th^{234}_{90}\text{Th}90234​Th. How many neutrons and how many protons does one nucleus of this isotope contain?

A

90 neutrons and 144 protons

B

90 neutrons and 234 protons

C

144 neutrons and 90 protons

D

234 neutrons and 90 protons

Markscheme

5.1 The nuclear model of the atom Questions

  1. IGCSE
  2. /Physics
  3. /5.1 The nuclear model of the atom

284 exam-style questions on CIE IGCSE Physics 5.1 The nuclear model of the atom, covering 5.1.1a Structure of the atom and ions, 5.1.1b Alpha-particle scattering, 5.1.2a Composition of the nucleus and isotopes, 5.1.2b Proton number, nucleon number and nuclide notation, and 5.1.2c Nuclear fission and nuclear fusion. Each one has a worked solution and a mark scheme showing where the marks go.

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