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After 4 half-lives what percent of the radioactive isotope is remaining?
Wiki User
∙ 14y ago
Every two years half of the parent (the original) isotope decays into the daughter isotope. Therefore, after just two years, 50% of the parent isotope will remain. In another half life (two years), half of that 50% will remain. Therefore, in four years two half lives have passed and 25% of the parent isotope remains.
Wiki User
∙ 15y ago
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Wiki User
∙ 13y agoThe isotope would go through 4 half-lifes, so there would only be 1/16 left. One half-life would be 1/2, half of that would be 1/4, half of that would be 1/8, and half of that would be 1/16.
Wiki User
∙ 11y agoIt would be 25% because a half life of a radioactive isotope is 50%. So divide 50 by 2 and u get 25.
Wiki User
∙ 13y agoAfter one half-life, one half (1/2) is remaining. So, after two half-lives, one fourth (1/4) of the material should remain.
Wiki User
∙ 13y ago12.5% One half life is one half of the mass. One half life is 50%, One half of 50% is 25%, and one half of 25% is 12.5% of the original mass.
Wiki User
∙ 14y ago1/16 = (1/2 * 1/2 * 1/2 * 1/2)
Wiki User
∙ 12y agoone sixteenth (1/16)
Wiki User
∙ 12y agoOne sixteenth. (1 / 24)
Wiki User
∙ 13y ago1/16th (0.0625) of the original quantity.
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After three half-lives what percent of the radioactive isotope is remaining?
12.5% is remaining.
What does carbordating mean?
Do you mean carbon dating? Carbon dating is a process that scientists use to try to ascertain the age of an item by analyzing the amount of a radioactive carbon isotope that is present in the item. Generally this is used to date biological items. Like, really old trees and stuff. The percent of the radioactive isotope in the specimen is accumulated to normal levels as the thing was alive, after it is dead it stops absorbing new carbon and thus by measuring the ratio of isotopes that are decaying we can determine the age of the item. (using the half-life of the radioactive isotope)
What is the use radioactive isotope in energy generation?
The most useful isotope is uranium 235 which occurs naturally as 0.7 percent uranium as found. Plutonium 239 is also useful but has to be made in a reactor from uranium 238
How many half-lives have passed for 50 percent of the original radioactive material?
One half-life.
Air is about 78.0 percent nitrogen molecules and 21.0 percent oxygen molecules Several other gases make up the remaining 1 percent of air moleculesWhat is the partial pressure of nitrogen in air at at?
0.780 Atm
After three half-lives what percent of the radioactive isotope is remaining?
12.5% is remaining.
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
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.
What does carbordating mean?
Do you mean carbon dating? Carbon dating is a process that scientists use to try to ascertain the age of an item by analyzing the amount of a radioactive carbon isotope that is present in the item. Generally this is used to date biological items. Like, really old trees and stuff. The percent of the radioactive isotope in the specimen is accumulated to normal levels as the thing was alive, after it is dead it stops absorbing new carbon and thus by measuring the ratio of isotopes that are decaying we can determine the age of the item. (using the half-life of the radioactive isotope)
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).
What is the natural percent abundance of the heavier isotope of gallium?
5%
Where is 77 percent of the remaining 2.8 percent found?
2.156
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
What is the use radioactive isotope in energy generation?
The most useful isotope is uranium 235 which occurs naturally as 0.7 percent uranium as found. Plutonium 239 is also useful but has to be made in a reactor from uranium 238
