When a nucleus of U 238 absorbs a neutron and becomes U 239?
By capturing a neutron, uranium-238 becomes uranium-239 that rapidly changes by beta radiation into neptunium-239. This neptunium is transformed then by beta radiation, after 3 days on average, into a new nucleus: plutonium-239. This radionuclide is fissile, like uranium-235.
When U 239 emits a beta particle The nucleus left behind has?
U-239 quickly emits a beta particle to become neptunium-239. Np-239 in turn emits a beta particle to become plutonium-239, which is relatively stable. Some Pu-239 nuclei may capture a neutron to become Pu-240, which is less stable. By further neutron capture, some Pu-240 nuclei may in turn form Pu-241.
What is the equation for nuclear fission of U-235?
It can be represented by this nuclear equation: 92 235 U + 1 neutron → 36 92 K r + 56 141 B a + 3 neutrons + energy.
How is the nucleus stretched into an elongated shape?
This splitting process is called nuclear fission. The absorption of a neutron by a uranium nucleus supplies enough energy to cause such an elongation. The resulting fission process may produce many differ- ent combinations of smaller nuclei.
What type of radiation is emitted when NP 239 decays into Pu 239?
beta particle
The U-239, in turn, decays by emitting a beta particle to neptunium-239, which gives off another beta particle. Since each beta decay turns a neutron into a proton, these two beta decays suffice to turn a uranium atom into one of plutonium.
Why is U-235 able to be used in nuclear power plants and nuclear fission bombs and U-238 is not?
Uranium-235 (natural abundance 0.71%) is very scarce and difficult to separate from uranium-238 (natural abundance 99.28%). The much more abundant uranium-238 does not undergo fission and therefore cannot be used as a fuel for nuclear reactors.
When U-235 undergoes fission the two nuclei that result have a total of ___ protons?
In the nucleus of each atom of uranium-235 (U-235) are 92 protons and 143 neutrons, for a total of 235.
What is U-239 in what ways is it different from U-238?
In what ways is it different from U-238? U-239 is an isotope of uranium. It has one more neutron in the nucleus than U-238.
What energy is released by fission of 1g U-235?
200 MeV
The energy released by fission of one `U^(235)` atom is 200 MeV.
Why is U-235 used in nuclear reactors instead of U 238?
As U-235 molecules are lighter than the U-238 molecules they move faster and have a slightly better chance of passing through the pores in the membrane.
Why are nuclei deformed?
In simple terms, deformation in nuclei seems to be caused by shell effects ( i.e., neutrons and protons move in quantized orbits with non-zero angular momenta, sometimes in pairs due to pairing forces) which produces a cooperative energy that would distort the spherical shape if nuclei were normal liquid drops.
What is the meaning of along gate?
: to extend the length of. intransitive verb. : to grow in length. elongate. adjective.
What happens to the reaction as the proportion of U-238 nuclei increases explain why this happens?
The reaction becomes slower. It takes more time to fission all of the U-235. This is because some of the neutrons hit U-238 and are absorbed, changing U-238 to U-239. The more U-238 there is the more likely it is that a neutron will hit a U-238 nucleus.
Can you touch plutonium?
A: Plutonium is, in fact, a metal very like uranium. If you hold it [in] your hand (and I’ve held tons of it my hand, a pound or two at a time), it’s heavy, like lead. It’s toxic, like lead or arsenic, but not much more so.
Why is U-235 better than U-238?
Why is U-238 more stable than U-235?
U238 may be more stable because the 3 extra neutrons in the nucleus keep the protons less repulsive toward one another than the nucleus of U235. The half life of U235 is 700 million years, and the half life of U238 is 4500 million years.
Which has the greater binding energy per number of nucleons U-235 or U-238?
7.570 MeV/nucleon The binding energy for 235U is 0.28% greater than that of 238U. This is not significant since greater stability would be expected with a greater binding energy per nucleon, but the half life of 235U is shorter than 238U.
Why is U-235 used more in nuclear reactors than U-238 is?
What type of radiation is emitted when NP 239 decays into Pu-239?
How much energy is released when 2 mole of u235 is Fissioned?
The fission of one uranium-235 atom releases about 200 MeV. Multiply that by 1.244*10^24 for 2 moles and you get about 2.5*10^26 MeV or about 4.0*10^13 Joules.
How much energy is released when 2 grams of U 235 completely undergoes fission?
556×104kWh.
What is the difference between U-235 and U-238?
Uranium is a chemical element well-known for its radioactive decay. U-235 and U-238 are two radioactive isotopes of Uranium. The main difference between U-235 and U-238 is that the number of neutrons present in the U-235 nucleus is 143 whereas the number of protons present in the U-238 nucleus is 146.
What can fission of U-235 produce?
When a U-235 nucleus absorbs an extra neutron, it quickly breaks into two parts. This process is known as fission (see diagram below). Each time a U-235 nucleus splits, it releases two or three neutrons. Hence, the possibility exists for creating a chain reaction.
What is the shape of nucleus?
Shape of the Nucleus: It varies widely, from spherical for doubly magic nuclei to ellipsoidal and sometimes pear shapes.
Which nuclei are spherical?
According to quantum mechanics, the neutrons and protons fill their quantum states independently, so that both full neutron and full proton shells can occur as magic nuclei. The nuclei have then a spherical shape and this happen for the magic numbers 2,8, 20,28,50,82 and 126.