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Edexcel IGCSE Physics 7.3 Atomic Number Mass Number and Isotopes Questions

Practise using atomic number, mass number and isotope notation to identify protons, neutrons and nuclei in Edexcel IGCSE Physics questions.

Syllabus
First assessment 2019
Course
Physics 4PH1

Exam points

  • calculate neutrons from mass number minus atomic number in isotope symbols
  • distinguish isotopes by same proton number and different neutron number in written definitions
  • interpret numbers beside nuclide symbols as proton number and nucleon number for a nucleus

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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