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How many neutrons are in Element 92?
Element number 92 is Uranium and there are two main isotopes - U235 and U238. In U235 there are 92 protons so there are 235 - 92 = 143 neutrons. In U238 there are thus 146 neutrons
Is uranium nuclear fuel?
Yes, U233, U235, and U238 are all used as nuclear fuels.
How are isotopes of the same element named?
The same name with a different atomic mass number. As an example U235 and U238 are two isotopes of Uranium
What do you called in an element having the same atomic number but different atomic masses?
Isotopes. eg U235 and U238. Both Uranium, atomic number 92, bur different isotopes.
What can isotopes of the same elements have a different number of what?
Neutrons in the nucleus of the element's atoms. It is the number of protons in the nucleus that determines what the element is. It is the total of neutrons and protons in the nucleus that gives the isotope number. Uranium generally comes in two isotopes, U235 and U238. All uranium is radioactive -- that is, it will decay into other elements over time. U238 is much more common and is very long lived radioactively and is not explosive and cannot be made into atomic bombs. U235 is much rarer, but is highly radioactive and can be made into atomic bombs. The two isotopes are mixed together at the atomic level. This is what Iran is trying to do now in it's efforts to concentrate enough U235 to make a bomb -- the process is called "enrichment."
What is meant by reactor grade materials?
This means that the nuclear material is of a high enough concentration to fissile (allow for a fission chain reaction). This is because Uranium comes naturally as 99.3% U238, which cannot sustain fission, and .7% U235, which is what they want for the fuel. So they have to find away to pull away the U238 and leave the U235. As they concentrate the U235, it becomes concentrated enough so that it can sustain fission (too much U238 bogs down the reaction and will eventually end the fission). When it reaches this point of concentration, it is concidered reactor grade. Different elements have different needed concentrations to reach this level.
What form of uranium is used in nuclear reactors?
Natural uranium consists of mainly U238 with about 0.7 percent U235, which is the fissile one, so enrichment is to raise the proportion of U235, which can be done by diffusion or by centrifuging, because of the slight difference in density, using uranium hexafluoride which is gaseous.
How many atoms in 1 gram of uranium?
Depends on the isotope. Most uranium found naturally is U238 and hence 238 g would be 1 mole. U235 used for fission and bombs would be 235g.
What are the examples of fissions?
The only example of nuclear fission in a naturally occurring material is of Uranium 235, which comprises 0.7 percent of natural uranium, the rest being Uranium 238 which is not fissile. To use U235 in a nuclear reactor it is usually enriched to about 4 percent first, though reactors have been designed to use natural uranium. These have to use graphite or heavy water as moderator, as normal water absorbs too many neutrons. During reactor operation some of the U238 absorbs a neutron and becomes Plutonium 239 which is also fissile, so this contributes to a proportion of the reactor power which increases as the fuel is used and the U235 diminishes.
Isotopes of elements?
Isotopes of elements are atoms with the same number of protons but different numbers of neutrons. This causes isotopes of the same element to have different atomic masses. Isotopes can be stable or unstable, with unstable isotopes undergoing radioactive decay.
Can you touch uranium with your bare hands and what are the effects?
Uranium is a very dense metal. The most common isotope, U238, has a very long half life. You can touch the ore, which is known as yellowcake. You could also hold the metal formed from that ore, pure uranium. Although it is radioactive, the half life is so long that only a few atoms of a large mass decay. The radiation emitted would be somewhat similar to normal background radiation. Depleted uranium (U238 which has had U235 and other isotopes removed) is used for some antitank shells because it is so heavy. It makes a great kinetic weapon.Uranium burns much like magnesium, so don't smoke around it!
Mass of uranium atom?
it is exactly 238.02891 u ± 0.00003 u or in other words you can write it as 395,256.10-24 grams
