The universal mass unit, abbreviated u (sometimes amu for atomic mass unit), is defined as one-twelfth of the mass of the 12C atom which has been defined to be exactly 12 u. The absolute mass of a 12C atom is obtained by dividing the value 12 by the Avogadro number (NA = 6.022 137...
The mass number is commonly cited in distinguishing among the isotopes of an element, all of which have the same atomic number (number of protons) and are represented by the same literal symbol; for example, the two best known isotopes of uranium (those with mass numbers 235 and 238) are...
It was the first fissile Uranium isotope to be discovered. When one neutron from the U-235 fission reaction causes another nucleus of this metal to undergo fission, it causes the entire chain reaction to continue. This condition is called the “critical condition” while the mass of U-235 re...
235, say 0.45 kg (1 pound), cannot undergo a chain reaction and is thus termed asubcritical mass; this is because, on average, the neutrons released by a fission are likely to leave the assembly without striking another nucleus and causing it to fission. If more uranium-235 is added to...
1.a bomb whose potency is derived from nuclear fission of atoms of fissionable material with the consequent conversion of part of their mass into energy. 2.a bomb whose explosive force comes from a chain reaction based on nuclear fission in U-235 or plutonium. ...
•Atomic and nuclear based allotropes, isomers&crystal structure. •Electron structure, orbital shells, orbital shapes and quantization. •Chemical bonding, bond angles, bond types and bond strength. •why matter and mass are not the same thing. ...
1.a bomb whose potency is derived from nuclear fission of atoms of fissionable material with the consequent conversion of part of their mass into energy. 2.a bomb whose explosive force comes from a chain reaction based on nuclear fission in U-235 or plutonium. ...
Atomic bombs have been designed by students, but their actual construction is a complex industrial process. Practical fissionable nuclei for atomic bombs are the isotopes uranium-235 and plutonium-239, which are capable of undergoingchain reaction. If the mass of the fissionable material exceeds the...
The most common nuclear fuels are 235U (the isotope of uranium with an atomic mass of 235 and of use in nuclear reactors) and 239Pu (the isotope of plutonium with an atomic mass of 23 29、9). These fuels break apart into a bimodal range of chemical elements with atomic masses centering...
nuclear fission, subdivision of a heavy atomic nucleus, such as that of uranium or plutonium, into two fragments of roughly equal mass. The process is accompanied by the release of a large amount of energy. What is the difference between nuclear fission and fusion?There are two ways of relea...