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CAIE A-Level Physics 11.1.3 Proton Number and Nucleon Number

Practise distinguishing proton, neutron and nucleon numbers, determining particle counts from nuclear notation and accounting for ion charge.

Syllabus
2028–2030
Course
Physics 9702
Level
AS

Exam points

  • distinguish nucleon number as the total number of protons and neutrons from proton number as the number of protons
  • determine proton number, neutron number or nucleon number from nuclear data or a nuclide description

11.1.3—Nucleon number and proton number question 1

[Maximum number: 1]

Nucleus Q undergoes radioactive decay to form nucleus R, emitting an antineutrino and another particle X, as shown in the decay equation.

Q→R+X+vˉQ \rightarrow R+X+\bar{v}

Compare the nucleon numbers of Q and R.

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