0
Uranium 238 change to lead 206 at the end of how many half lives?
Wiki User
∙ 14y ago
Uranium-238, or more properly 92238U, is naturally radioactive. (It does not "become" radioactive.) Radioactivity of an isotope simply means that it has an unstable nucleus. It is unstable because the nucleus is large enough that the nuclear force (residual strong atomic force) that holds the nucleus together is offset by the competing electromagnetic force which makes protons repel each other. The reason for this offset is that the nuclear force declines with distance at a greater rate than the electromagnetic force. There are other reasons for radioactivity, such as isotopic variations in neutron to proton ratio, but the size of the nucleus is primary, for elements with atomic number greater than 82.
Wiki User
∙ 13y ago
Wiki User
∙ 14y agoFor the integral transformation: more tha 20 half lives of uranium 238.
Wiki User
∙ 12y agoBy a process called radioactive decay; see the link below.
Wiki User
∙ 13y agoAn example of the disintegration of a radioactive nucleus. The lead isotope is the end, nonradioactive product.
Wiki User
∙ 15y ago1:3
Add your answer:
Earn +20 pts
Who in lead with uranium?
Isotopes of lead are the final products of the decay chain of uranium.
What does uranium become when it decays?
If we use uranium-238 as our starter isotope, what happens is that a nuclear decay event happens (in this case an alpha decay) and the U-238 transforms into a daughter isotope thorium (Th-234). The half-life of this transition is 4.5 billion years. Thorium-234 then undergoes a decay. And the process continues until a stable isotope is created as the last daughter of a decay chain. Note that there will be different half lives for the transition events, and the modes of decay will vary depending on what daughter is now the parent in the next decay event. Use the link below to see all the steps. The chart will show the whole chain including the half-life of isotope undergoing decay, the decay mode, and the daughter. Follow along using the keys and the process will reveal itself.
Is uranium more dense than lead?
Uranium is more dense than lead, yes. The density of the two metals is 19.1 and 11.34 grams per cubic centimeter, respectively. That makes uranium almost twice as dense as lead.
Uranium-235 has a half-life of 700 million year. how long does it take a 100 gram sample of uranium to decay to a mass of 50 grams?
If a radioactive isotope has a half-life of 4 years, than 0.125 (0.53) of the isotope will remain after 12 years, or 3 half-lives.The question asked about Uranium. There is no isotope of Uranium with a half-life of 4 years. The closest is 232U92, which has a half-life of 68.9 years.Reference: http://www.nndc.bnl.gov/chart/
Examples of radioisotope and their half life?
The half life of the radioactive isotope of iodine comes into play when it is being prescribed as treatment for some thyroid conditions. In order for the material to be of the correct strength, it has to be prepared, delivered and administered at just the right time.
Why is lead found in all deposits of uranium ores?
Uranium has a half life of 5,600 years. After that period, one half of the uranium becomes lead. That is why lead is found in uranium deposits.
What is the problem with disposing of radioactive wastes is that they have a long what?
Radioactive substances have half-lives. This is because the isotope constantly is changing from the radioactive isotope to a daughter element. For example, eventually, when uranium's radioactivity is gone, it becomes lead. After one half life of a radioactive substance, only 50% of that substance is still radioactive. Therefore, after one half-life, a piece of uranium is 50% lead and therefore %50 less radioactive. After another half-life, it has 25% of the original radioactivity, and 75% of the original uranium has become lead. This is the problem with radioactive wastes. It takes many years just for one half lives for some substances, such as uranium. Because radioactivity is harmful, those substances have to be stored until they are no longer radioactive. So, in short, the problem with disposing of radioactive wastes is that they have long half-lives. (although this is not true with ALL substances because some have short half-lives, but, in general, radioactive substances have long half-lives.
How many years would it take for half of the atoms in uranium to change into lead?
The half-life of 214Bi is 19.7 minutes. However, it has two decay modes, neither of which leads directly to lead; that complicates things. One of the decay modes leads to 214Po, which then quickly (half-life 0.0016 seconds) decays to 210Pb. The other one leads to 210Tl, which has a half-life of 1.3 minutes and also decays to 210Pb. So: Half of the 214Bi will be gone in 19.7 minutes; a bit after that half the sample will be 210Pb.
Uranium 238 decays to lead 206 how much of the oringinal uranium will remain after the third half life passes?
12.5 %
What is uranium lead method?
This is a method based on the decay chain of uranium and half lives and is very useful to evaluate the age of rocks.The method has a very high range - from 1 000 000 years to 4 500 000 000 years - and is surprisingly exac
What radioactive element turns to lead when it has lost lots of energy?
It is uranium that is changed into lead during radioactive decay. Note that there are a number of intermediate steps in the conversion of uranium into stable lead. The uranium does not change directly into lead. The uranium atom undergoes decay, and a radioactive daughter product appears. This continues with radioactive daughters appearing at the end of every step - until lead appears.
How much lead is in 1 kilogram of pure molten uranium?
Since you have stated that the uranium is pure, it is therefore all uranium and contains no lead; lead is not uranium.
What is it called when uranium turns to lead?
Uranium is radioactive. Which means its nucleus will emitt an alpha particle (two protons and two neutrons) spontaneously. Because the nucleus lost two protons it becomes the element Thorium. Thorium also emitts alpha's and changes to Radium. This process continues; Radium into Radon into Polonium and finally into lead. The final Lead is not radioactive and the process ends. The actual process is a little more complicated because some of these intermediate elements can change by converting a neutron into a proton and emitting an electron (beta radiation), but the basic process is one radioactive element changes into another radioactive element by emitting radiation (alpha's or beta's). The Uranium to Lead Process has a half-life of about 4.5 billion years. Meaning that in 4.5 billion years 1 kilogram of Uranium will have changed to a half kilogram lead and a half kilogram Uranium is still left. This is approximate because there will also be some of those intermediate elements waiting to change.
Who in lead with uranium?
Isotopes of lead are the final products of the decay chain of uranium.
What does uranium become when its lost its radioactivity?
Uranium becomes lead
What is uranium-lead method?
the uranium-lead method is a method to determanie the age of Earth's oldest rocks
Is lead heavier than uranium?
Yes, uranium is more dense (heavier) than lead.
