what does the band of stability for atomic nuclei refer to? brainly

Nuclear Chemistry
Examples of
Multiple Option Questions

ane.: The "magic numbers" for atoms are; (a) numbers of electrons that confer diminutive stability.; (b) numbers of protons and/or neutrons that confer nuclear stability.; (c) n/p ratios that confer nuclear stability.; (d) diminutive masses that confer nuclear stability.; (eastward) atomic masses that indicate fissile isotopes.
2.: The actual mass of a ³⁷Cl cantlet is 36.966 amu. Calculate the mass defect (amu/atom) for a ³⁷Cl atom.; (a) 0.623 amu; (b) 0.388 amu; (c) 0.263 amu; (d) 0.341 amu; (eastward) none of these
3.: The mass defect for an isotope was found to be 0.410 amu/atom. Summate the binding energy in kJ/mol of atoms. (one J = 1 kgm²/s²); (a) 3.69 ten 10¹⁰ kJ/mol; (b) 1.23 x 10^twenty kJ/mol; (c) iii.69 x 10¹³ kJ/mol; (d) 1.23 ten 10³ kJ/mol; (e) 1.23 x ten²³ kJ/mol
4.: Calculate the binding free energy per nucleon (in units of MeV) for ^ixBe, for which the diminutive mass is nine.01219 amu. Particle masses in amu are: proton = 1.007277; neutron = i.008665; electron = 0.0005486. Conversion factor for Eastward = mc² is 931 MeV/amu.; (a) half dozen.46 MeV; (b) 6.33 MeV; (c) vi.23 MeV; (d) 11.39 MeV; (due east) 56.93 MeV
5.: Which isotope beneath has the highest nuclear bounden energy per gram? No adding is necessary.; (a) ^fourHe; (b) ^sixteenO; (c) ³²Southward; (d) ⁵⁵Mn; (e) ²³⁸U
6.: Which of the following statements is incorrect?; (a) Mass defect is the amount of matter that would be converted into energy if a nucleus were formed from initially separated protons and neutrons.; (b) Nuclear binding free energy is the free energy released in the formation of an atom from subatomic particles.; (c) Nuclei with highest binding energies are the most stable nuclei.; (d) Einstein postulated the Theory of Relativity in which he stated that thing and energy are equivalent.; (due east) Mass number is the sum of all protons and electrons in an atom.
vii.: A positron has a mass number of _____, a accuse of _____, and a mass equal to that of a(an) _____.; (a) 0, ane+, proton; (b) 1, 2+, proton; (c) 0, 1+, electron; (d) one, 2+, electron; (east) 0, 0, proton
8.: Emission of which one of the post-obit leaves both atomic number and mass number unchanged?; (a) positron; (b) neutron; (c) alpha particle; (d) gamma radiation; (e) beta particle
9.: Which type of radiations is the least penetrating?; (a) alpha; (b) beta; (c) gamma; (d) x-ray; (e) neutron
10.: A radioisotope of argon, ³⁵Ar, lies beneath the "ring of stability: (n/p ratio too low). One would predict that it decays via _____.; (a) neutron emission; (b) beta emission; (c) positron emission; (d) blastoff emission; (e) fission
11.: A Geiger-Muller tube is a _____ .; (a) gas ionization detector; (b) cloud sleeping room; (c) fluorescence detector; (d) spectrophotometer; (due east) photographic detector
12.: The half life of ²³¹Pa is 3.25 ten x⁴ years. How much of an initial 10.forty microgram sample remains after iii.25 x 10⁵ years?; (a) 0.0102 micrograms; (b) 0.240 micrograms; (c) 2.18 micrograms; (d) 0.0240 micrograms; (e) 1.04 micrograms
thirteen.: Consider the case of a radioactive element X which decays by electron (beta) emission with a half-life of 4 days to a stable nuclide of element Z. Which of the following statements is CORRECT?; (a) After 8 days the sample will consist of one-fourth chemical element Z and iii-fourths chemical element 10.; (b) Element Z volition counterbalance exactly the same every bit chemical element 10 when decay is consummate (weighed to an space number of significant figures).; (c) 2.0 m of element X is required to produce i.v thousand of chemical element Z later 8 days (to 2 significant figures).; (d) If element X as an diminutive number equal to n, and so element Ten has an atomic number equal to n-1.; (due east) None of the above.
14.: Carbon-11 is a radioactive isotope of carbon. Its half-life is 20 minutes. What fraction of the initial number of C-11 atoms in a sample will take decayed away subsequently lxxx minutes?; (a) ane/16; (b) 1/eight; (c) 1/4; (d) 7/eight; (e) xv/16
15.: How old is a bottle of wine if the tritium (^threeH) content (called activeness) is 25% that of a new wine? The half-life of tritium is 12.5 years.; (a) 1/iv year; (b) three.i yr; (c) 25 yr; (d) 37.v year; (eastward) 50 year
16.: A Geiger counter registered 1000 counts/second from a sample that contained a radioactive isotope of polonium. After 5.0 minutes, the counter registered 281 counts/second. What is the half-life of this isotope in seconds?; (a) 87; (b) 110; (c) 164; (d) 264; (e) 2.18
17.: The ¹⁴C activity of some ancient Peruvian corn was establish to exist 10 disintegrations per minute per gram of C. If present-day plant life shows fifteen dpm/chiliad, how one-time is the Peruvian corn? The half-life of ¹⁴C is 5730 years.; (a) 1455 years; (b) 1910 years; (c) 3350 years; (d) 3820 years; (due east) 9080 years
xviii.: Which of the post-obit describes what occurs in the fission process?; (a) A heavy nucleus is fragmented into lighter ones.; (b) A neutron is split into a neutron and proton.; (c) Two light nuclei are combined into a heavier one.; (d) A proton is separate into three quarks.; (east) A particle and anti-particle appear in an area of high energy density.
19.: Which of the post-obit statements about nuclear fission is e'er right?; (a) Very trivial energy is released in fission processes.; (b) Nuclear fission is an energetically favorable process for heavy atoms.; (c) Due to its instability, ⁵⁶Fe readily undergoes fission.; (d) In fission reactions, a neutron is split into a proton and an electron.; (east) All nuclear fission reactions are spontaneous.
20.: Which one of the following would exist most likely to undergo thermonuclear fusion?; (a) ²H; (b) ⁴He; (c) ⁵⁶Fe; (d) ¹⁴¹Ba; (e) ²³⁵U
21.: Which one of the following statements about nuclear reactions is false?; (a) Particles within the nucleus are involved.; (b) No new elements can be produced.; (c) Rate of reaction is independent of the presence of a catalyst.; (d) Charge per unit of reaction is independent of temperature.; (due east) They are often accompanied past the release of enormous amounts of energy.
22.: Complete and balance the following equation. The missing term is _____ . ²³⁹Pu + alpha particle _____ + neutron; (a) two ¹¹⁵Ag; (b) two ¹⁰⁶Rh; (c) ²³⁵U; (d) ²³³Pa; (east) ²⁴²Cm
23.: When ⁵⁹Cu undergoes positron emission, what is the immediate nuclear product?; (a) ⁵⁹Ni; (b) ⁵⁸Ni; (c) ⁵⁸Cu; (d) ⁵⁹Zn; (due east) ⁵⁸Zn
24.: As a upshot of the process of electron capture ("Thousand-capture") past ²¹¹At, the new isotope formed is:; (a) ²¹⁰At; (b) ²¹²At; (c) ²¹¹Po; (d) ²¹¹Rn; (eastward) ²⁰⁷Bi
25.: When ²³⁵U is bombarded with ane neutron, fission occurs and the products are three neutrons, 94Kr, and _____ .; (a) ¹³⁹Ba; (b) ¹⁴¹Ba; (c) ¹³⁹Ce; (d) ¹³⁹Xe; (e) ¹⁴²I

Answers:

1. (b) two. (d) 3. (a) four. (a) 5. (d) half dozen. (east) 7. (c) eight. (d) ix. (a) 10. (c) 11. (a) 12. (a) thirteen. (c) fourteen. (e) xv. (c) sixteen. (c) 17. (c) 18. (a) 19. (b) 20. (a) 21. (b) 22. (eastward) 23. (a) 24. (c) 25. (a)

To report any corrections, delight electronic mail Dr. Wendy Keeney-Kennicutt.

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Source: https://www.chem.tamu.edu/class/fyp/mcquest/ch26.html

what does the band of stability for atomic nuclei refer to? brainly

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