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No, it has a half-life* of around 4.468 billion years
*A Half-life is the time it takes for the amount of substance undergoing decay to half.
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∙ 12y ago
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What number is written after the isotope when writing the name?
The atomic mass number of that isotope. So C14 has a molecular mass of 14 grams/mole U238, 238 grams/mole
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."
Is half life the same for each isotope?
The term half life describes the rate at which the isotopes of a particular atom decay. Thus, if you have a lump of Uranium 238 (U238), then the atoms in the lump will decay at the same rate as the half life. If that lump was created four billion years ago and it consisted of 100% U 238, today the lump would be half U238 and half something else, mostly lead. That would go for both the atoms and the whole lump. If the lump consisted of 10% U238 today it would consist of 5% U238, and 95% something else. The fact that the U238 has a half life of 4 billion years only affects the Uranium and nothing else.
Isotopes of elements?
Uranium has a number of isotopes including U235 and U238, both of which are radioactive
What keeps the rocks inside the earth in molten state?
Radioactive decay in the inner core of k40 U238 and Th232 cause the earths internal heat plus lithostatic pressure (pressure of the overlying rocks).
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 is one of the daughter elements of urainium-238?
U238 is a stable isotope of uranium - it doesn't undergo decay except at a very very slow rate unless hit with Neutrons - then it will decay to Neptunium
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!
How can the radioactive nuclide plutonium 239 be prepared using nuclear equations?
U238 + n --> U239 : capture, crosssection 2.73 barnsU239 --> Np239 + e- : beta decay, half-life 23.5 min.Np239 --> Pu239 + e- : beta decay, half-life 2.33 days
What do you use to split a uranium nucleus in nuclear fission?
Fast neutrons fro U238 but you can use slower neutrons for U235. Other fast bombardment nucleii may also be used
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 Pb-206 radioactive?
Yep! It is the last product in the chain of decay of Radium and Uranium series. There are a lot of nasty products that they decay into before becoming lead-206 (which takes about 4.5 billion years) but once there, the final product: "lead-206" should not give you cancer as it is stable (non-radioactive). Don't eat it of course because it's still poisonous (chemically).
