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Practice Questions



This activity contains 25 questions.

Question 1.
What is the atomic number of 23692U?


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Question 2.
What is the atomic mass number of 23692U?


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Question 3.
What is the neutron number of 23692U?


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Question 4.
What is the mass of 23692U to the nearest u?


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Question 5.
What is the actual mass of 23692U?


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Question 6.
What is the answer to Question 5 in kilograms?


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Question 7.
Which of the following is not a reason why the answers to Question 4 and 5 are not exactly equal?


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Question 8.
The mass of 126C is exactly 12.000000 u. Why?


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Question 9.
What element is given by 4020X, where X stands for the element symbol, but is not the symbol?


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Question 10.
What is the binding energy of the 126C nucleus?


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Question 11.
9038Sr is radioactive. What form of radiation does it emit?


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Question 12.
What is the half-life of 9038Sr?


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Question 13.
What isotope results from the decay of 9038Sr?


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Question 14.
If you start out with 8 x 1024 9038Sr, how many do you have after two half-lives?


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Question 15.
The mass of 9038Sr is 89.907737 u and the mass of the atom its beta decays to is 89.907151 u. What is the energy released in the decay?


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Question 16.
How many 9038Sr atoms would there be in 1 gram of the substance?


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Question 17.
What is the decay constant for 9038Sr?


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Question 18.
How long would it take a sample of 7 x 1021 of 9038Sr atoms to decrease to 6 x 1010 atoms?


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Question 19.
What would be the activity of the strontium sample at the end of the period covered in Question 18?


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Question 20.
2211Na decays via positron emission into


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Question 21.
22890Th emits a gamma ray. The resulting nucleus is


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Question 22.
In beta decay an electron is emitted along with the daughter nucleus. What is the other particle emitted?


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Question 23.
253100Fm decays via electron capture. The resulting element is


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Question 24.
21084Po decays by alpha decay. The resulting isotope is


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Question 25.
What is the energy released in the above decay?


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