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Chapter 29: Problem 8

Write the symbol (in the form \(_{Z}^{A} \mathrm{X}\) ) for the nuclide that has 78 neutrons and 53 protons.

Short Answer

Expert verified
Answer: The nuclide symbol for this isotope is \(_{53}^{131} \mathrm{I}\).

Step by step solution

01

Find the element symbol

The element symbol can be found by matching the atomic number (Z) to its corresponding element in the periodic table. The problem states that there are 53 protons, so the atomic number is 53. Upon looking it up on the periodic table, the element with Z = 53 is Iodine (I).
02

Calculate the mass number

To find the mass number (A), add the number of protons (Z) and the number of neutrons. In this case, there are 53 protons and 78 neutrons. The mass number is then: A = 53 (protons) + 78 (neutrons) = 131
03

Write the nuclide symbol

Using the values found in steps 1 and 2, the nuclide symbol in the form \(_{Z}^{A} \mathrm{X}\) can be written as: \(_{53}^{131} \mathrm{I}\)

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Most popular questions from this chapter

The half-life of I-131 is 8.0 days. A sample containing I- 131 has an activity of \(6.4 \times 10^{8}\) Bq. How many days later will the sample have an activity of \(2.5 \times 10^{6} \mathrm{Bq} ?\) (Wills tutorial: radioactive decay)
Approximately what is the total energy of the neutrino emitted when ${ }_{11}^{22} \mathrm{Na}$ decays by electron capture?
A water sample is found to have \(0.016 \%\) deuterium content (that is, $0.016 \%\( of the hydrogen nuclei in the water are \)^{2} \mathrm{H}$ ). If the fusion reaction \(\left(^{2} \mathrm{H}+^{2} \mathrm{H}\right)\) yields 3.65 MeV of energy on average, how much energy could you get from \(1.00 \mathrm{L}\) of the water? (There are two reactions with approximately equal probabilities; one yields \(4.03 \mathrm{MeV}\) and the other \(3.27 \mathrm{MeV} .\) ) Assume that you are able to extract and fuse \(87.0 \%\) of the deuterium in the water. Give your answer in kilowatt hours.
A neutron-activated sample emits gamma rays at energies that are consistent with the decay of mercury-198 nuclei from an excited state to the ground state. If the reaction that takes place is$\mathrm{n}+(?) \rightarrow{ }^{198} \mathrm{Hg}^{*}+\mathrm{e}^{-}+\bar{v},$ what is the nuclide "(?)" that was present in the sample before neutron activation? ( \(\mathrm{W}\), tutorial: neutron detector)
In naturally occurring potassium, \(0.0117 \%\) of the nuclei are radioactive \(^{40} \mathrm{K} .\) (a) What mass of \(^{40} \mathrm{K}\) is found in a broccoli stalk containing \(300 \mathrm{mg}\) of potassium? (b) What is the activity of this broccoli stalk due to \(^{40} \mathrm{K} ?\)
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