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2012-10-19 22:38:32
2012-10-19 22:38:32

Uranium-235 and uranium-238 are different isotopes of the element uranium. They have different mass numbers due to different numbers of neutrons.


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Most do. They are called isotopes. For a particular element the number of protons in the nucleus is the same, but there can be different numbers of neutrons. For example uranium235 and uranium238 where the number is called the mass number, which is the sum of the numbers of protons and neutrons in the nucleus. Isotopes of hydrogen are specially given individual names (hydrogen, deuterium, tritium) but they are all "chemically" hydrogen (protons=1, electrons=1).

The reaction produces more neutrons than were needed to start it.

Coal, oil, natural gas, Uranium235

700 milliion years. The definition of half-life is the period of time during which one-half of the atoms of an element undergo decay into other elements.

Nuclear energy as used in power plants results from fission of uranium235 and plutonium239

Uranium, Plutonium and Thorium...the most common being uranium which when dug out of the ground is 99.3% uranium238 and only 0.7% uranium235. U235 is the nuclei best suited to nuclear fission which means natural uranium is enriched to raise the percentage of U235 to about 3-5% (enriched uranium)...this creates a lot of waste U238 which could be made into plutonium but is usually just stored. If the final use of the uranium is a bomb rather than energy, the enrichment percentage increases far more.

From the fissioning of the nuclei of uranium235 and plutonium239. The energy released appears as thermal energy in the surrounding fuel material

Uranium-235: 92 protons, 143 neutrons; fissionable with thermal neutrons; Uranium-238: 92 protons, 146 neutrons; fissionable with fast neutrons; the atomic mass is greater with 3 compared with the atomic mass of uranium-235.

Nuclear energy is energy released either by fissioning of heavy nuclei such as Uranium235 or Plutonium239, or by fusion of light isotopes such as those of hydrogen.

Essentially all of the atom's mass is in the nucleus. In the lightest atom, that of hydrogen, it's about 99.95 percent. In the heaviest naturally occurring atom, that of Uranium238, it's about 99.979 percent.

Basically, from the fission or splitting of the nucleus, mainly of Uranium235,but also of Plutonium239. When the nuclei of these elements is fissioned, heat is released and this heat can then be used to produce electricity.

Depends on the size of your pellet. 1 kg of Uranium235 is equivalent to 1500 tonnes of coal.

Nuclear energy is obtained by the fissioning of nuclei of uranium235, in a controlled chain reaction in a nuclear reactor, which produces heat that can be converted to electricity by normal power plant methods.

depends on the amount. Bryan's answer above is correct for the entire amount of an element that is present, but for an individual atom of an element, the answer is yes! Uranium, for instance, exists naturally as three different isotopes, U234, U235 and U238, the difference being the number of neutrons in the nucleas, and therefore, the atomic weights - 234, 235 and 238. In other words, a chunk of Uranium238 will weigh more than an equal sized chunk of 234.

The two isotopes (or varieties) of the element uranium, U238 and U235 have slightly different weights due to different numbers of neutrons in the nucleus. But, they have the same atomic number (meaning they have the same number of protons in the nucleus and the same number of electrons bound to the nucleus). Because they have the same number of electrons, from a chemical point of view, they are identical: that is, they form the same kinds of bonds with other elements and they cannot be separated by chemical means.

Atomic energy is produced when atoms of uranium235 or other fissile material split, or undergo fission. It is nothing to do with fluorescence, and I don't understand 'heat mass'

These are the constituents of atoms. Nuclei are made up of protons and neutrons. Useful nuclear energy is only obtained from a few nuclei which can be made to fission and release energy. The two main ones are Uranium235 and Plutonium239.

Since that is exactly 2 times the half-life, 1/4 (that is, 1/2 x 1/2) of the original amount will be left.

The purpose of a breeder reactor is to produce fissile fuel from non-fissile material. Thus plutonium can be bred from uranium238 which is the most common form of uranium but is not itself fissile. Another route is to breed Uranium 233 from thorium. Of course the breeder reactor would also produce electricity.

1 kg of uranium235 will give as much energy as 1,500,000 kg of coal, so that indicates the difference between nuclear and chemical reaction output. Fusion gives a bit more per kg of fuel than does fission-but we don't know how to use it yet.

Nagasaki- Fat man(plutonium) Hiroshima-Little boy(uranium235) Add to that the 100,000s of unnamed (or named after GI's girlfriends) phosphorous incendiaries, magnesium incendiaries, and high explosive bombs. Which did far more total damage and killed more people per raid than either atomic bomb did.

Basically a nuclear weapon is an explosive device that derives its destructive force from nuclear reactions, either fission or a combination of fission and fusion.A nuclear bomb also known as an atomic bomb. This is a bomb where nuclear fission is the sole source of the energy for the explosion. This explosion occurs when uranium235 and/or plutonium239 is transformed from a subcritical mass to a supercritical mass very rapidly, when a few neutrons are then fired into that supercritical mass the chain reaction continues and cascades at an exponentially increasing rate until it results in a huge explosion. However such fission only bombs have a theoretical limit to their yield of under 1 megaton.If fusion is involved somewhere in the bomb, hydrogen nuclei (typically deuterium and tritium) fuse. By use of multiple fusion stages the yield of such bombs can be increased without theoretical limit.Some very high yield fusion bombs are enclosed in a shell of uranium238 which will not normally fission, however the very high energy fusion neutrons can cause it to fission. This one feature can provide as much as 90% of the bomb's total yield, but also increases fallout by a similar amount.

Thorium itself is not a fuel, it does not emit energy. However if it is irradiated in a reactor it forms uranium233 which is a fissile isotope of uranium. Therefore potentially thorium can be used to breed fissile fuel. There are issues around reprocessing however which have not been tackled because the incentive is not there whilst uranium235 is available. Thorium might become important in the future, or for a country which has thorium but not uranium. See link below

Different solids have different shapes and volumes.Different solids have different shapes and volumes.Different solids have different shapes and volumes.Different solids have different shapes and volumes.

Fender Stratocsters have been manufactured in different years, by different companies, in different countries, in different colours, with different woods and materials and different electronics in different styles and different sizes with different hardware and different serial numbers with different $ values, and make different sounds due to having different pickups in different configurations with different qualities. Hope this answers your question

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