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Why are elements with a low z have a higher electron density And why do these elements absorb neutrons better than lead?
You asked two widely disparate questions, but there is a connection. 1) See: http://www.chemistry.mcmaster.ca/esam/Chapter_5/section_3.html Light atomic weight elements have higher electron densities due to the nuclei's effective charge with regard to the orbital shells. This is a complicated geometric question of how the nucleons are arranged. The nucleus has a structure just as the electron orbital "shells" have one. 2) See: http://www.ncnr.nist.gov/resources/n-lengths/list.html. The neutron absorption of lead is not much compared to many other elements. And again this has to do with nucleus structure. Isotopic forms of the same element have wildly different absorption cross-sections. Neutron absorption is important to nuclear weapons design and nuclear energy. Here are some sites that do a great job at answering complicated questions such as this: http://csep10.phys.utk.edu/guidry/Math-9-94html/models.html http://forum.physorg.com
What else can I help you with?
What are the four main elements that make up a reactor core?
The four main elements in a nuclear reactor core are fuel rods (containing enriched uranium or plutonium), control rods (to absorb neutrons and regulate the fission reaction), coolant (such as water or gas to transfer heat), and a moderator (to slow down neutrons to sustain the chain reaction).
Can free electron absorb photon?
Yes, free electrons can absorb photons. When a photon interacts with a free electron, it can transfer its energy to the electron, causing it to move to a higher energy level or even be ejected from the material. This process is the basis for various phenomena such as photoelectric effect and Compton scattering.
What is needed to excite electrons?
For example when the electron absorb energy.
How many neutrons would an iron-56 nucleus absorb during a supernova explosion to produce an arsenic-75 nucleus?
To produce an arsenic-75 nucleus from an iron-56 nucleus, the iron must absorb neutrons and undergo a series of transformations. Iron-56 has 26 protons and 30 neutrons, while arsenic-75 has 33 protons and 42 neutrons. This means that to reach arsenic-75, the iron-56 nucleus needs to absorb enough neutrons to increase its neutron count to 42 while also changing the number of protons through beta decay. Therefore, iron-56 would need to absorb approximately 7 neutrons during the process.
How much energy a hydrogen atom with its electron in the E2 energy level must absorb for the electron to be removed from the atom.?
To remove an electron from a hydrogen atom that is in the E2 energy level, the atom must absorb energy equal to the ionization energy from that level. The ionization energy from E2 is approximately 10.2 eV. Thus, the hydrogen atom must absorb at least 10.2 eV of energy for the electron to be completely removed from the atom.
How do control rods absorb neutrons in a nuclear reactor?
Control rods in a nuclear reactor absorb neutrons by containing materials that readily capture neutrons, such as boron or cadmium. When these materials absorb neutrons, they prevent the neutrons from causing further nuclear reactions, helping to control the rate of fission in the reactor.
How light is absorb?
By the agitation of an electron by a photon.
What are the four main elements that make up a reactor core?
The four main elements in a nuclear reactor core are fuel rods (containing enriched uranium or plutonium), control rods (to absorb neutrons and regulate the fission reaction), coolant (such as water or gas to transfer heat), and a moderator (to slow down neutrons to sustain the chain reaction).
What Elements in the outer layers of a star absorb?
In the outer layers of a star, elements such as hydrogen, helium, and heavier elements like carbon, nitrogen, and oxygen absorb specific wavelengths of light. This absorption occurs due to the excitation of electrons in these elements, which absorb photons and move to higher energy levels. The resulting absorption lines in a star's spectrum provide valuable information about its composition, temperature, and density. These interactions also play a crucial role in the star's energy balance and evolution.
What are controls rods used for?
They are neutron absorbers, and by raising/lowering they can absorb variable amounts of neutrons. This allows the reactor to be maintained just critical at a steady power, or power to be raised/lowered, or shutdown completely and safely held down.
What element is used in the control rods of nuclear reactors?
One or more elements that strongly absorb neutrons, some are:cadmiumboronhafniumetc.
What absorbs neutrons in a nuclear reactor and begins with C?
We see the use of control rods in a reactor to absorb neutrons. These rods are often made of boron.
Can free electron absorb photon?
Yes, free electrons can absorb photons. When a photon interacts with a free electron, it can transfer its energy to the electron, causing it to move to a higher energy level or even be ejected from the material. This process is the basis for various phenomena such as photoelectric effect and Compton scattering.
What in nuclear reactors to absorb neutrons?
Control rods, typically made of materials such as boron or cadmium, are used in nuclear reactors to absorb neutrons and regulate the nuclear reaction. By controlling the number of neutrons present, the rate of fission reactions can be managed to maintain a steady level of power generation.
What kind of elements are used in nuclear reactors?
Uranium is the fuel... moderators can be water... control rods are various substances to absorb extra neutrons some use carbon. Steel (iron) is what the reactor vessel is made of.
What is needed to excite electrons?
For example when the electron absorb energy.
How many neutrons would an iron-56 nucleus absorb during a supernova explosion to produce an arsenic-75 nucleus?
To produce an arsenic-75 nucleus from an iron-56 nucleus, the iron must absorb neutrons and undergo a series of transformations. Iron-56 has 26 protons and 30 neutrons, while arsenic-75 has 33 protons and 42 neutrons. This means that to reach arsenic-75, the iron-56 nucleus needs to absorb enough neutrons to increase its neutron count to 42 while also changing the number of protons through beta decay. Therefore, iron-56 would need to absorb approximately 7 neutrons during the process.
