1. A radioactive decay series that begins with 232 90 Th ends with formation of
ID: 850699 • Letter: 1
Question
1. A radioactive decay series that begins with 23290 Th ends with formation of the stable nuclide 20882 Pb. How many alphaparticle emissions and how many beta-particle emissions are involved in the sequence of radioactive decay?
2. The atomic msses of nitrogen-14, titanium-48, and xenon-129 are 13.999234 amu, 47,935878 amu, and 128,904779 amu, respectively. For each isotope, calculate a) the nuclear mass, b) the nuclear binding energy, c) the nuclear binding energy per nucleon.
3. A 53.8 mg sample of sodium perchlorate contains radioactive chlorine-36 ( whose atomic mass is 36.0 amu). If 29.6% of the chlorine atoms in the sample are chlorine-36 and the remainder are naturally occuring nonradioactive chlorine atoms, how many disintegrations per second are produced by this sample? The half life of chlorine-3 is 3.6 x 105 yr.
4. Complete and balance the following nuclear equations by supplying the missing particle:
a) 147N + 42 He --> ? + 11 H
b) 4019 K + -10e (orbital electron) --> ?
c) ? + 42 He --> 3014 Si + 11 H
d) 5826 Fe + 210 n --> 6027 Co + ?
e) 23592 U + 10 n --> 13554 Xe + 210n + ?
Explanation / Answer
4)
1)8O16
2)41K19
3)13AL27
4)BETA PARTICLE
5)94Sr38
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