Physics 0625 · IGCSE · The nuclear model of the atom

The nuclear model of the atom — practice question

The proton numbers and nucleon numbers for four nuclides are listed as: $^{231}_{88}\text{Ra}$, $^{232}_{90}\text{Th}$, $^{238}_{92}\text{U}$, $^{239}_{94}\text{Pu}$. Which statement is correct?

  • APlutonium (Pu) contains one more proton than uranium (U).
  • BThorium (Th) contains one more neutron than radium (Ra).
  • CThorium (Th) contains one more proton than radium (Ra).
  • DUranium (U) contains one more neutron than plutonium (Pu).

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