(a)[2]
Write the nuclide notation that represents radium-223.
(b)[1]
Determine the number of neutrons in a single nucleus of radium-223.
(c)[3]
Calculate the time needed for the mass of radium-223 in the sample to decay from 32 mg to 4 mg.
Physics 0625 · IGCSE · Radioactivity
Radioactivity — practice question
Radium is a radioactive element whose chemical symbol is Ra. Radium has proton number 88. Radium-223 is an isotope of radium with nucleon number 223.
Worked solution & mark scheme
This 6-mark question has a full step-by-step worked solution and mark scheme. One marking point: “Ra shown in nuclide notation with mass number 223 and proton number 88 correctly placed” …
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