This actinium isotope has a nucleus containing 89 protons and 136 neutrons. The chemical symbol for actinium is Ac.
(a(i))[1]
Write the nuclide notation for this actinium isotope.
(a(ii))[1]
State how many electrons are present around the nucleus of a neutral atom of this isotope.
(b)[3]
On Fig. 10.1, add two further points to show the mass remaining after 20 days and 30 days. Then draw the decay curve for the sample over 30 days.
Worked solution & mark scheme
This 5-mark question has a full step-by-step worked solution and mark scheme. One marking point: “225 as the nucleon number; 89 as the proton number (Ac)” …