- pisgahchemistLv 78 years agoFavorite Answer
Nuclei of U-238 atoms are not stable, although they have a half-life which is very long, about 4.5 billion years, about the age of the Earth. The nuclei undergo decay by alpha emission.
92U238 --> 2He4 + 90Th234
- FredLv 78 years ago
U238 is the non fissionable cousin to fissionable U235. It occurs in soil over the earth and is responsible for the gas called radon which is about a third of the way down its decay chain. At the end of the chain is lead 206.
U239 can be converted to Plutonium by bombardment of the Pu by neutrons or deuterons.
Its nuclei consist of 92 protons and 146 neutrons.
U238 is slightly radioactive with a half life of about 4.5 billion years.Source(s): retired chem teacher USA