The Nucleus: A Chemist’s View. Chapter 20 E-mail: firstname.lastname@example.org Web-site: http://clas.sa.ucsb.edu/staff/terri/. The Nucleus: A Chemist’s View. 1. Supply the missing particle for each of the following nuclear reactions: a. 73 Ga 73 Ge + ? b. 192 Pt 188 Os + ?
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1. Supply the missing particle for each of the following nuclear reactions:
a. 73Ga 73Ge + ?
b. 192 Pt 188Os + ?
c. 205Bi 205Pb + ?
d. 241Cm + ? 241Am
2. Write an equation for each of the following:
a. Electron capture to 68Ga
b. Positron emission of 62Cu
c. Alpha decay of 212Fr
d. Beta decay of 129Sb
3. The radioactive isotope 247Bk decays by an alpha and beta series ending in 207Pb. How many alpha and beta particles were emitted in the series?
4. The only stable isotope of fluorine is fluorine-19. Predict possible modes of decay for fluorine-21 and fluorine-18.
5. The first atomic explosion was detonated on July16, 1945. What fraction of the strontium-90 (t1/2 = 28.8 yr) will remain as of July 16, 2014?
6. The sun radiates 3.9 x 1023 J of energy into space every second. What is the rate at which mass is lost from the sun?
7. The most stable nucleus in terms of binding energy per nucleon is 56Fe. If the atomic mass of 56Fe is 55.9349 amu, calculate the binding energy per nucleon for 56Fe. (neutron = 1.67493 x 10-27 kg, proton = 1.67262 x 10-27 kg)
8. A positron and an electron annihilate each other upon colliding, thereby producing energy in the form of 2 photons. Calculate the wavelength of the light produced.
(mass of an electron = 9.10938 x10-31kg)
9. Define fusion and fission.
10. A freshly isolated sample of 90Y was found to have an activity of 9.8×105 disintegrations per minute at 1:00 pm on December 3, 2000. At 2:15 pm on December 17, 2000, its activity was redetermined and found to be 2.6×104 disintegrations per minute. Calculate the half-life of 90Y.