Questions

Note: You will need the table of atomic weights inside the back cover of this text.


1		Give the number of protons and the number of neutrons in the nucleus of each of the following isotopes: aluminum-25 technetium-95 tin-120 mercury-200



2		Write the nuclear symbols for each of the nuclei in exercise 1.



3		Predict if the nuclei in exercise 1 are radioactive or stable, giving your reasoning behind each prediction.



4		Write a nuclear equation for the beta emission decay of each of the following: ⁵⁶₂₆Fe ⁷₄Be ⁶⁴₂₉Cu ²⁴₁₁Na ²¹⁴₈₂Pb ³²₁₅P



5		Write a nuclear equation for each of the following alpha emission decay reactions: ²³⁵₉₂U ²²⁶₈₈Ra ²³⁹₉₄Pu ²¹⁴₈₃Bi ²³⁰₉₀Th ²¹⁰₈₄Po



6		If the half-life of cesium-137 is 30 years, how much time will be required to reduce a 1.0 kg sample to 1.0 g?



7		The half-life of tritium () is 12.26 years. What is the radioactive decay constant for tritium?



8		What is the number of disintegrations per unit of time for a molar mass of tritium? The decay constant is obtained from exercise 7.



9		Calculate the activity in curies of the molar mass of tritium described in exercise 8.



10		How much energy is needed to separate the nucleons in a single lithium-7 nucleus? (The mass of a lithium-7 nucleus is 7.01435 u, one proton is 1.00728 u, and one neutron is 1.00867 u.)

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