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If an Isotope has a 75 year half life how long until the parent isotope has decayed to 1 percent of the initial number?
Wiki User
∙ 14y ago
It will take between 450 and 525 years.
Wiki User
∙ 14y ago
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The daughter isotope is 87.5 percent if the half-life of the isotope is 150 million years how old is the sample?
a sample is brought to the laboratory and the chemist determines the percentage of the daughter isotope is 87.5%. if the half-life of the isotope is 150 million years, how old is the sample?
Which uranium isotope is onley 0.7 percent of natural uranium and is the fissile part?
Uranium 235 is 0.7 percent of natural uranium and is fissile
Is the uranium-235 isotope the most commonly used fuel in fission power plants?
Yes U235 is the fissionable isotope of Uranium. Natural Uranium contains only about 0.7 percent U235, which is enough to produce fission only with a good moderator such as graphite or heavy water. In light water reactors the Uranium has to be enriched to about 4 percent U 235.
Is N-14 or N-15 more abundant in nitrogen?
Nitrogen 14 is by far the most abundant isotope (99.63% abundant).An easy way to figure out which one is the most abundant is to look at the periodic table. The mass on the periodic table is the weighted average of all possible isotopes. The atomic mass of nitrogen is 14.00674. You can gather from this that the most abundant isotope is N-14, since the number is VERY close to 14.It is also possible to guess the most common isotope if you do not have access to a periodic table. Nitrogen has 7 protons and the most stable isotope is Nitrogen 14, which has 7 neutrons in addition to the protons. In virtually all elements, the stable isotopes are those that have the same or very similar number of neutrons as the number of protons in the nucleus. This works for Carbon which has 6 protons and 6 neutrons in the nucleus for Carbon 12, the most common isotope.This is also true for Oxygen 16 (8P and 8N), Silicon 28 (14P and 14N), and just about any element you choose.An isotope of nitrogen containing seven neutrons would be nitrogen - 15.
How old is a rock for which you determine that 55 percent of the original uranium-238 remains while the other 45 percent has decayed into lead?
3.88 billion years
If the half-life of a radioactive substance is 10 hours how long will it take for 50 percent of it to decay?
The half-life of a radioactive isotope is defined as the time taken for the isotope to decay to half of its initial mass. So to decay to 50 percent of its initial mass will take one half-life of the isotope. One half-life of the isotope is 10 hours so the time taken to decay is also 10 hours.
Why is each isotope's mass multiplied by the isotope's percent abundance?
That is done to calculate the weighted average.
How do you calculate the atomic weight of a chemical element that has two or more isotopes?
Calculation of the atomic weight of an element having many isotopes:ia - atomic mass of the isotope a x percent concentration of the isotope in the elementib - atomic mass of the isotope b x percent concentration of the isotope in the elementic - atomic mass of the isotope c x percent concentration of the isotope in the element...........................................................................................................................iz - mass of the isotope z x percent concentration of the isotope in the elementMake the sum: I = ia + ib + ic + ..... izThe atomic weight of the element is: I/100 (the term weight is recommended by IUPAC in this case).
The daughter isotope is 87.5 percent if the half-life of the isotope is 150 million years how old is the sample?
a sample is brought to the laboratory and the chemist determines the percentage of the daughter isotope is 87.5%. if the half-life of the isotope is 150 million years, how old is the sample?
What is the natural percent abundance of the heavier isotope of gallium?
5%
Consider an element Z that has two naturally occurring isotopes with the following percent abundances the isotope with a mass number of 19 is 55 percent abundant the isotope with a mass number?
19.9
The 1st isotope occurs 75.47 percent of the time and has a mass of 248.7 amu the 2nd isotope occurs 24.53 percent of the time and has a mass of 249.4 amu calculate the average atomic mass?
248.90
Which uranium isotope is onley 0.7 percent of natural uranium and is the fissile part?
Uranium 235 is 0.7 percent of natural uranium and is fissile
After three half-lives what percent of the radioactive isotope is remaining?
12.5% is remaining.
What is percent abundance?
Take percent abundance times atomic mass for each isotope then add all up for average atomic mass.
The time it takes for 50 percent of the nuclei in a radioactive sample to decay to its stable isotope is called?
the half-life
Calculate the average atomic mass of an unknown element that has two naturally-occurring isotopes The first isotope occurs 75.47 percent of the time and has a mass of 248.7 amu The second isotope occu?
the atomic mass is -(248.90)
