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Chapter 21: Q37 E (page 1147)
Identify the subshell in which electrons with the following quantum numbers are found:
(a)n= 3,l= 2
(b)n= 1,l= 0
(c)n= 4,l= 3
(a)2p
(b) 1s
(c) 4f
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The isotope \({}_{{\rm{38}}}^{{\rm{90}}}{\rm{Sr}}\) is one of the extremely hazardous species in the residues from nuclear power generation. The strontium in a \({\rm{0}}{\rm{.500 - g}}\) sample diminishes to \({\rm{0}}{\rm{.393 g}}\)in \({\rm{10}}{\rm{.0 y}}\). Calculate the half-life.
A \({\rm{1}}{\rm{.00 \times 1}}{{\rm{0}}^{{\rm{ - 6}}}}{\rm{ - g}}\) sample of nobelium, \({}_{{\rm{102}}}^{{\rm{254}}}{\rm{No}}\), has a half-life of \({\rm{55}}\) seconds after it is formed. What is the percentage of \({}_{{\rm{102}}}^{{\rm{254}}}{\rm{No}}\) remaining at the following times?
(a) \({\rm{5}}{\rm{.0 min}}\)after it forms
(b) \({\rm{1}}{\rm{.0 h}}\)after it forms
How does nuclear fission differ from nuclear fusion? Why are both of these processes exothermic?
Given specimens neon-24 and bismuth-211 (\(\left( {{t_{1/2}} = 3.38\;{\rm{min}}} \right)\)\(\left. {{t_{1/2}} = 2.14\;{\rm{min}}} \right)\)of equal mass, which one would have greater activity and why?
Technetium\({\rm{ - 99}}\) is often used for assessing heart, liver, and lung damage because certain technetium compounds are absorbed by damaged tissues. It has a half-life of \({\rm{6}}{\rm{.0 h}}\). Calculate the rate constant for the decay of \({}_{{\rm{43}}}^{{\rm{99}}}{\rm{Tc}}\).
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