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WorksheetsWednesday, May 20th - Review
Total questions: 10
Worksheet time: 7mins
The symbol for potassium-40 looks like this. How many nucleons are in this nuclide?
19 nuclides total
21 nuclides total
40 nuclides total
59 nuclides total
Which of the following is a nuclide of potassium-40?
None of the above are nuclides of potassium-40
The symbol for potassium-40 looks like this. How many protons and neutrons does this nuclide have?
40 protons, 19 neutrons
19 protons, 40 neutrons
19 protons, 21 neutrons
21 protons, 19 neutrons
Based on the number of protons and neutrons in this nucleus, would you expect this to be stable?
yes, because there is an odd number of protons and odd number of neutrons
maybe because the number of protons should be odd while the number of neutrons should be even in order to be stable
no because there are too many nucleons in order to be stable
no because odd numbers of either protons or neutrons leads to greater probability of instability
Potassium-40 is unstable and decays in at least four known methods. Which type of decay would this be?
alpha
beta-positive
beta-negative
gamma
One method of decay emits a beta-negative particle also known as an electron. Use the periodic table and the equation to determine the daughter nucleus.
Potassium-40 can also emit a gamma ray. Which reaction best shows this emission?
You eat a banana and naturally ingest K-40 as a result. How does the number of K-40 nuclei change in your body over time?
The potassium is mixed with two other radioactive nuclides but it has the longest half-life of the three. All have 100 nuclei to start and decay over time. Which function represents the number of undecayed potassium?
A
B
C
Need more information.
One type of decay that Potassium-40 does not do is alpha decay. What is wrong with the alpha decay reaction as written below?
It does not show transmutation from one element to another.
It does not use the correct symbol/values for alpha decay.
It does not obey conservation of mass number.
It does not obey conservation of charge.
