If you think to uranium 235 the half life is 703 800 000 years.
Pu-239 has a half-life of 24,110 years.
Each isotope of uranium has its half life. See the link below.
The half-life of 238U is 4.468x109 years.
700 million years
After the second half-life of uranium, half of the original amount will remain. Therefore, if you start with 80 grams of uranium, after one half-life you would have 40 grams remaining, and after the second half-life, you would have 20 grams.
Pu-239 has a half-life of 24,110 years.
Uranium is a radioactive element and conteneously disintegrate into smaller element, that time in which 1g of uranium becomes half g is known as half life period of uranium.
Each isotope of uranium has its half life. See the link below.
The approximate half life of Uranium 238 is 4.5 x 109 years.
The half-life of 238U is 4.468x109 years.
The half life of 238U is 4,468.109 years; this is a very long halflife !
The half-life of uranium-239 is 23.45 minutes.
The half-life of the isotope uranium-238 is 4 468 000 000 years.
700 million years
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.
Uranium has the longest half-life element
Half life is the time taken for half the atoms to decay. Whatever mass you start with, if it is a sample consisting of one pure uranium isotope, you will have half that mass of uranium after one half life. The piece of metal will not weigh half of the original mass, because the decay products will be there. In practice, a piece of uranium usually consists of a mixture of isotopes with different half lives.