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Vew assignmentProblemiD-95717781 To see favorites here, select then and drag to the Favorites Bar folder. Or import from another browser Import favorites Assignment 3: Chapter 21 Part 1 Identification and Characterization of Unstable and Stable Nuclei Brla 12 of 15 Part B Using general tendencies and the chart given in the introduction, predict the most lkely mode of decay of Nuclear stability can in general be predicted based on the following considerations each of the following radioactive isotopes Drag the appropriate items to their respective bins View Available Hints) Nuclei with 84 protons or more are Nuclei containing mage number of protons and/or neutrons tend to be stable Stable nuclel often contain even numbers of protons and/or neutrons Reset Help These factors are refected in the given graph (Figure gure 1 of1 130 e emission e capture a decay neutron-to proton ratico 01020 30 40 50 60 Number of protons G14 re to search

Explanation / Answer

Part A :
bromine - 90 will undergo - decay
Platinum -183 will give positron emission i.e) 0+1e emission
Fluorine - 17 will give positron emission i.e)  0+1e emission
uranium -238 will undergo - decay most likely.
calcium-50 will undergo - decay

Part B :
At = Ao * (1/2)t/t1/2  
40.1 = Ao * (1/2)8/3.2
Ao = 226.8398 gms was present 8 hours ago.

Part C:
For 50% decay it takes 432 years
t1/2 = 0.693 / k = 432
k = 1.6041*10-3
ln (At / Ao) = -kt
Now At = 0.55 Ao i.e (Ao - 0.45Ao)
ln ( 0.55 Ao / Ao) = -1.6041*10-3 * t
t = 372.693 years = time taken for 45% of Am-241 to decay.

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