See the link below for radioactive decay chains.
The end products of uranium isotopes decay chain are the isotopes of lead.
Because the stable isotopes of lead are the end products of the decay chain of uranium natural radioactive isotopes. or because lead is the product of decayed uranium... that should be a good enough answer for your chem teacher you cheater!
Isotopes of lead
Ultimately lead, as it is the only element in the uranium decay chains with isotopes that are stable. Specifically the isotopes 206, 207, and 208; each of which is the end of a different decay chain.
It is not yet discovered since all of the uranium isotopes are having half life for several millions of years. We would be able to find it after atleast 700 millions of years.
Isotopes of radon (Rn)
The loss of mass in a sample of uranium compound could be due to radioactive decay, where uranium isotopes (e.g., uranium-238) are converting into other elements and emitting particles in the process. This decay leads to the creation of daughter products and a decrease in the overall mass of the sample over time.
Thorium, radium, radon, polonium, thallium, etc.
The end element of the uranium decay chain is a stable isotope of lead.
20 isotopes
All the isotopes from the decay chains exist in these rocks. The most important are the dangerous isotopes of radium and radon.
Polonium isotopes are decay products of thorium or uranium.