It is thorium 234.
232U alpha decays to 228Th. Thorium-228 is the daughter product of the alpha decay of uranium-232.
Uranium-235 will not beta decay first. If you google "Chart of Nuclides" you can follow the entire decay chain yourself using each isotope's most likely decay type.
Uranium has a different decay chain/series for its different isotopes. Uranium 238 for example first decays to thorium 234 through alpha decay while U235 alpha decays to thorium 231. Both have different half lifes which can be found on a natural decay series chart for the said element. The thorium in either case then beta decays to another element.
The existence of radiation was discovered in 1896 by Henri Becquerel in the course of experiments involving uranium salts, though the nature of it was unknown. The nature of the alpha particle was discovered by Ernest Rutherford, and he showed it was essentially an helium nucleus in 1907.
The first radioactive element formed when uranium-238 decays is thorium-234. Uranium-238 undergoes alpha decay to form thorium-234.
232U alpha decays to 228Th. Thorium-228 is the daughter product of the alpha decay of uranium-232.
The first step is an alpha decay to (guess what!) uranium 235. You can probably take it from there.
Uranium-235 will not beta decay first. If you google "Chart of Nuclides" you can follow the entire decay chain yourself using each isotope's most likely decay type.
Uranium has a different decay chain/series for its different isotopes. Uranium 238 for example first decays to thorium 234 through alpha decay while U235 alpha decays to thorium 231. Both have different half lifes which can be found on a natural decay series chart for the said element. The thorium in either case then beta decays to another element.
The existence of radiation was discovered in 1896 by Henri Becquerel in the course of experiments involving uranium salts, though the nature of it was unknown. The nature of the alpha particle was discovered by Ernest Rutherford, and he showed it was essentially an helium nucleus in 1907.
U-238 is the most abundant (99.3%) of the three naturally occurring isotopes of Uranium. The other two are U-235 and U-234.U-238 decays spontaneously to Thorium-234 by alpha particle emission. This decays by beta decay to Protactinium-234 and then that undergoes beta decay to become U-234.There are many more decay steps by alpha and beta emission. The end result is Lead-206 which is stable.The full path can be found in the Argonne National Laboratories Human Health Fact Sheet, August 2005, titled Natural Decay Series: Uranium, Radium, and ThoriumThis is found at:http://www.ead.anl.gov/pub/doc/natural-decay-series.pdf
The first radioactive element formed when uranium-238 decays is thorium-234. Uranium-238 undergoes alpha decay to form thorium-234.
Uranium 238 breaks down into a series of radioactive products formed by giving off radiation. Uranium-238, Thorium-234, Protactinium-234, and Uranium-234 are the first 4 in the series.
The beta decay of uranium-237 can be represented by the equation: (^{237}{92}U \to ^{237}{93}Np + e^- + \bar{\nu_e}) where (^{237}{92}U) decays into (^{237}{93}Np), an electron (e^-), and an electron antineutrino (\bar{\nu_e}).
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.
First off, it's better to be more careful in regards to the word element. What you actually mean is isotope. The difference is subtle, but important. If I had a large rock of Uranium ore that was just mined, you could say I had the element Uranium. However, the element is made up of a certain percentage of isotopes, those being a nucleus that has the same number of protons, 92 in this case, but different numbers of neutrons.Secondly, alpha decay is defined as the spontaneous emission of a helium 4 nucleus from an isotope, so one of your two resulting elements when alpha decay is involved is always going to be helium. The other element is found by simply subtracting 2 from Pu's atomic number, which is 94, giving you the resulting element's atomic number, which is 92, otherwise known as uranium, specifically, the isotope U 234.
When uranium-238 (atomic number 92) decays by emitting an alpha particle, it transforms into thorium-234 (atomic number 90) because an alpha particle contains two protons and two neutrons, reducing the atomic number by two.