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Uuq
- a radioactive transuranic element
Ununtria
- a radioactive transuranic element
Ununtrium
- a radioactive transuranic element
Uut
- a radioactive transuranic element
Urania
- Uranium - a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
Uranium
- Uranium - a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
Uranium 235
- a uranium isotope with mass number 235; capable of sustaining chain reactions
- a uranium isotope with mass number 235; capable of sustaining chain reactions
Uranium 238
- the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239
- the commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239
Undersoil
- the layer of soil between the topsoil and bedrock
Undersoils
- the layer of soil between the topsoil and bedrock