How many neutrons, protons, and electrons are in carbon? What is the mass in grams of 44.5 mol Xe? Why is Avogadro's number called the mole? Why does one multiply the mass of one element in a given compound by the moles of that compound to find the amount of the elements present in...
Control rods made of materials such as cadmium and boron can be raised or lowered into the reactor to soak up neutrons and slow down or speed up the chain reaction. Water is pumped through the reactor to collect the heat energy that the chain reaction produces. It constantly flows around a...
In PGAA, a beam of neutrons is often extracted from through a reactor beam port. This means that the neutron flux is of the order of 1 million times lower than in the reactor, but it means that the detectors can be placed very close to the sample. In many cases, this will offset th...
What does the reactivity of a compound suggest and how it is determined? Name five elements from the periodic table. Instead of losing electrons in ionization, can you lose neutrons or protons? How many neutrons, protons, and electrons are in carbon? How ca...
Neutron Variation in Isotopes One might anticipate that, if so tiny an atom as helium can have as many as two extra neutrons and remain stable, surely larger atoms with considerably more protons should be able to vary by many more than two neutrons. Is this a valid supposition? Not really...
Current is simply a bunch of moving electrons, and moving electrons make a magnetic field. This is how electromagnets are made to work. This will be important to keep in mind as we zoom into the structure of atoms. Around the nucleus of the atom, where the protons and neutrons live, ...
The formula for calculating critical mass is: mc^2 = (N/A) * E, where m is the mass of the material, c is the speed of light, N is the number of neutrons released per fission, A is the atomic mass of the material, and E is the energy released per fission. Are there any fact...
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All matter is composed of atoms. Atoms, in turn, are composed of positively charged protons, negatively charged electrons, and neutral neutrons. The protons and neutrons, which are of approximately equal size, comprise the close-packed central "nucleus" of the atom, where almost all of the mas...
In theory, it is necessary to split only one U-235 atom, which will release neutrons that will split other atoms, which will release neutrons ... and so on. This progression is not arithmetic; it is geometric and takes place within a millionth of a second. The minimum amount to start...