Random
Isotopes of a given element will have a different number of this particle
What is neutrons?
An isotope has a half live of 45 years. If 315 years have passed, how many half-lives have passed?
What is 7 half-lives?
What type of decay is the following:
60 60 0 0
Co --> Ni + e + γ
27 28 -1 0
What is gamma decay?
Which type of decay does not affect any part of the atomic notation?
What is gamma radiation?
A= A0 x (½)^n
What does n refer to?
The number of half-lives
How many protons does Plutonium-260 have?
What is 94 protons?
How many grams of sample decayed if you start with 75 grams of sample and end with 7 grams of sample?
What type of particle will complete the reaction?
14 14
C --> N + ?
6 7
Beta particle
What type of decay is shown below?
131 131 0
I --> Xe + e
53 54 -1
What is beta decay?
What does it mean if you get a decimal for a half life?
The half life has not completed yet.
How many neutrons does Krypton-80 have?
What is 44 neutrons?
Os-182 has a half-life of 21.5 hours. How many grams of a 10.0 gram sample would remain after exactly three half-lives?
What is 1.25 g?
Find the error below of the alpha decay of Sr-87
87 4 83
Sr --> He + Bi
38 2 36
Element in end should be Kr. They used the mass number instead of atomic number.
Do atoms decay at a constant rate?
No (exponential, not linear)
The proportion left of the parent nuclei after two half-lives.
What is 25%
Which decay particle can only be stopped by lead or multiple feet of concrete?
What is a gamma particle?
The half-life of Zn-71 is 2.4 minutes. If you had 100.0 g at the beginning, how many grams would be left after 7.2 minutes?
What is 12.5 g?
Fill in the blank and tell what type of decay is present:
235 231 4
U --> ? + Th + He
92 90 2
0
γ
0
Gamma Decay
Rank the types of radioactive decay from strongest to weakest
gamma, beta, alpha
A half-life is the amount of time it takes for half of a sample's _______ to decay.
What is nucleus/nuclei?
If the half-life of a 2.0 gram sample of a radionuclide is 15 hours, then the half-life of a 1.0 gram sample of the same radionuclide would be
What is 15 hours?
How LONG will it take for a 40 gram sample to decay to 1/100 of the original mass? A half life is 8 days.
6.64 half-lives ---> 53.4 days
Rubidium-87 undergoes beta decay. Write an equation representing this process.
87 87 0
Rb --> Sr + e
37 38 -1
Explain the changes that occur in the parent nucleus during alpha decay
What is, the loss of 2 protons and 4 neutrons (mass number goes down by 4)?
n = log (remaining/original)
___________________
log ½
If you plug in 0.75 for the (remaining over original), give an example of what the remaining and original amount could be.
ex: 75 for remaining, 100 for original