2-52. Gallium is a metal with a wide variety of uses, including computer memory chips, light-emitting di- odes, and lasers. Radioactive isotopes of gallium are used to image the human body and locate tumors. Naturally occurring gallium consists of two isotopes. Using the average atomic mass of gallium listed in the periodic table inside the cover of this book, fill in the missing data in the table below. (Hint: Because gallium consists of only two isotopes, what can you conclude about the sum of their abundances?) H (6) 1

2-52. Gallium is a metal with a wide variety of uses, including computer memory chips, light-emitting di- odes, and lasers. Radioactive isotopes of gallium are used to image the human body and locate tumors. Naturally occurring gallium consists of two isotopes. Using the average atomic mass of gallium listed in the periodic table inside the cover of this book, fill in the missing data in the table below. (Hint: Because gallium consists of only two isotopes, what can you conclude about the sum of their abundances?) H (6) 1

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter2: Atoms And Molecules

Section: Chapter Questions

Problem 2.19PAE: 2.19 Naturally occurring uranium consists of two isotopes, whose masses and abundances are shown...

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2.11 Define the term isotope.
The following table presents the abundances and masses of the isotopes of zinc. What is the atomic weight of zinc?
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?
Cerium is the most abundant rare earth metal. Pure cerium ignites when scratched by even a soft object. It has four known isotopes: 136Ce(atomicmass=135.907amu) ,138Ce(atomicmass=137.905amu) ,140Ce(atomicmass=139.905amu), and142Ce(atomicmass=141.909amu). Ce-140 and Ce-142 are fairly abundant. Which is the more abundant isotope?
Which of the following are isotopes of element X, the atomic number for which is 9: 919X, 920X, 189X, and 921X?
2-103 The element silver has two naturally occurring isotopes: 109Ag and 107Ag with a mass of 106.905 amu. Silver consists of 51.82% 07Ag and has an average atomic mass of 107.868 amu. Calculate the mass of 109Ag
Neon is an inert gas with three stable isotopes. It is used in gas lasers and in advertising signs. Its isotopes and their abundances are: Ne-20 19.9924 amu 90.51% Ne-21 20.9938 amu 0.27% Ne-22 21.9914 amu 9.22% What is the average atomic mass of neon?
2-17 How does Dalton’s atomic theory explain: (a) the law of conservation of mass? (b) the law of constant composition?
Both atomic elements and molecular elements exist. Are there such entities as atomic compounds and molecular compounds? If so, provide an example and microscopic drawing. If not, explain why not.
2. Which of the following is closest to the observed abundance of 71Ga, one of two stable gallium isotopes (69Ga and 71Ga)? 20% 60% 70% 40%