2.28 The following radioactive isotopes are used in medicinefor imaging organs, studying blood circulation, treatingcancer, and so on. Give the number of neutrons presentin each isotope: "98 Au, “"Ca, “Co, 'ºF, 12$1, '3'1, ª²K, 4*K,24Na, 3ºP, 8$Sr, "Tc.85,99.

Isotopes are the nuclides which contain same atomic number but different mass number. Atomic number…

Answered: 2.28 The following radioactive isotopes…

Chemistry: Matter and Change

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Chapter4: The Structure Of The Atom

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2.86 For some uses, the relative abundance of isotopes must be manipulated. For example, a medical technique called boron neutron capture therapy needs a higher fraction of 10B than occurs naturally to achieve its best efficiency. What would happen to the atomic weight of a sample of boron that had been enriched in 10B? Explain your answer in terms of the concept of a weighted average.
2.19 Naturally occurring uranium consists of two isotopes, whose masses and abundances are shown below: Only 235U can be used as fuel in a nuclear reactor, so uramium for use in the nuclear industry must be enriched in this isotope. If a sample of enriched uranium has an atomic weight of 235.684 amu, what percentage of 235LT is present?
For each pair of elements listed, predict which one has more stable isotopes. (a) Ni or Cu (b) Se or Sb (c) Cd or Au
What is the nuclide symbol for the nucleus that contains 11 protons and 12 neutrons?
2.10 Which isotope in each pair contains more neutrons? (A) 35Cl or 33S, (b) 19F or 19Ne, (c) 63Cu or 65Zn, (d) 126I or 127Te
Though the common isotope of aluminum has a mass number of 27, isotopes of aluminum have been isolated (or prepared in nuclear reactors) with mass numbers of 24, 25, 26, 28, 29, and 30. How many neutrons are present in each of these isotopes? Why are they all considered aluminum atoms, even though they differ greatly in mass? Write the atomic symbol for each isotope.
Fill in the following table:
Balance the following equations by filling in the blanks. (a) 92235U+01n54137_+201n+_ (b) 90232Th+612__01n+96240Cm (c) 24He+4296Mo43100_+_ (d) _+12H84210_+01n
Write appropriate symbols for the following particles using the ZAX symbolism: a.A tin-117 nucleus b.A nucleus of the chromium (Cr) isotope containing 26 neutrons c.A nucleus of element number 20 that contains 24 neutrons
Write the nuclide notation, including charge if applicable, for atoms with the following characteristics:(a) 25 protons, 20 neutrons, 24 electrons(b) 45 protons, 24 neutrons, 43 electrons(c) 53 protons, 89 neutrons, 54 electrons(d) 97 protons, 146 neutrons, 97 electrons
Nuclei differ in their stability, and some are so unstable thatthey undergo radioactive decay. The ratio of the number of neutrons to number of protons (N/Z) in a nucleus correlateswith its stability. Calculate the N/Zratio for (a) ¹⁴⁴Sm; (b) ⁵⁶Fe;(c) ²⁰Ne; (d) ¹⁰⁷Ag. (e) The radioactive isotope ²³⁸U decays ina series of nuclear reactions that includes another uranium isotope,²³⁴U, and three lead isotopes, ²¹⁴Pb, ²¹⁰Pb, and ²⁰⁶Pb. How manyneutrons, protons, and electrons are in each of these five isotopes?
Gold has one stable isotope, whichis gold-197, with an atomic mass of 196.97amu. A 14k (14-karat) gold contains 58.3% of gold and 41.7% of other metals. How manyatoms of goldare present in a 5.00-g sample of 14k gold?

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2.28 The following radioactive isotopes are used in medicine for imaging organs, studying blood circulation, treating cancer, and so on. Give the number of neutrons present in each isotope: "98 Au, “"Ca, “Co, 'ºF, 12$1, '3'1, ª²K, 4*K, 24Na, 3ºP, 8$Sr, "Tc. 85, 99.