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Edexcel IGCSE Physics 7.3 Atomic Number Mass Number and Isotopes Questions

Use the proton number and nucleon number to distinguish isotopes and calculate the neutrons in a nucleus.

Syllabus
First assessment 2019
Course
Physics 4PH1

Exam points

  • Calculate the number of neutrons by subtracting proton number from mass number in isotope notation.
  • Define isotopes as atoms with the same proton number but different numbers of neutrons.
  • Interpret nuclide notation by identifying the proton number and the total nucleon number.

Edexcel IGCSE Physics 7.3 Atomic Number Mass Number and Isotopes Questions question 1

[Maximum number: 1]

This question is about radioactive isotopes used for medical imaging.

lodine-131 is represented by this symbol.

53131I{ }_{53}^{131} \mathrm{I}

How many neutrons are in the nucleus of an atom of iodine-131?

A

53

B

78

C

131

D

184

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