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daughter element
These are all phenomenons in nuclear physics.
Uranium 238 is transformed in thorium 234 by alpha decay.
It means that the corresponding element (or isotope) is unstable; the atoms will decay eventually.
Uranium-239 does NOT decay by alpha decay, it decays only by beta and gammadecay.
The end products of uranium isotopes decay chain are the isotopes of lead.
There are 3 naturally occurring isotopes of Uranium, all decay by alpha to Thorium:238U --> 234Th + 4He235U --> 231Th + 4He234U --> 230Th + 4He
Only the end product of the decay chain of uranium, a non radioactive isotope of lead.
Uranium slowly decay to form the stable nucleus of Lead after a series of nuclear reactions.
Isotopes of lead are the final products of the decay chain of uranium.
See the link below for radioactive decay chains.
It is thorium 234.