IB Physics SL E.3.1 Isotopes

Practise identifying isotopes from nuclide notation, calculating neutron number and explaining how equal proton number with different neutrons changes mass but not chemical…

Syllabus
First assessment 2025
Objective
—
Level
SL

Exam points

  • read proton number Z and nucleon number A from nuclide notation and calculate neutrons as A - Z
  • identify isotopes as nuclei of one element with equal proton number but different neutron number
  • use isotope abundances and masses to calculate a weighted mean atomic mass when data are supplied

E.3.1—Isotopes question 1

[Maximum number: 1]

This section consists of three questions: B1, B2 and B3.

The isotope tritium (hydrogen-3) has a radioactive half-life of 12 days.

State what is meant by the term isotope.

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