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Why U 235 is fissioned by thermal neutron while U 238 by a fast neutron?
It's to do with the capture cross-section of the nucleus. It just happens that the U-235 nucleus has a much larger cross-section for neutron capture when the neutrons are slow, and that the subsequent nucleus is unstable and splits into two parts. With U-238, it does not undergo fission at all, it just absorbs the fast neutron and transmutes to Pu-239. As to the fundamental reason for this, it is in the complex nuclear physics field of study
How do I save pictures in my windows8 Gmail?
open the picture u got in a mail in gmail , when u will open it u will see a download sign on top right corner or left corner ,search for the symbol . click on it and it will ask u the location in which u want to save our picture, select location and click save ,and the pic is downloaded
How many neutrons does an atom of U-251 have?
Number of neutrons = Mass number - Atomic number = 251 - 92 = 159
What is 107.9 la kalle phon number?
when your listening to the radio station the give out numbers u call n ask for the number
What does a circle inside a square symbolise?
The squared circle usually represents the perfection of geometric proportions, how a perfect circle fits into a perfect square, the diameter of the former being identical to the side of the latter. This symbol or rather its meaning is frequently used for drawing and architecture concepts.
What is the symbol for the nucleus of each isotope of uranium?
The symbol for the nucleus of each isotope of uranium is U. Each isotope will have a different number of protons and neutrons, but they will all have the element symbol U as their nucleus.
What is the symbol for mass number?
There are two in current use. For an atomic mass unit, one would use the symbol "u". For a Dalton one would use "Da".
What is the meant by atomic number?
The number equal to the total number of protons in the elementAtomic number:It is the following number in the Periodic Table, and by definition equal to the number of protons of the atom of that unique element.Example:Hydrogen, atom symbol H, number 1, protons: 1Carbon, atom symbol C, number 6, protons: 6Uranium, atom symbol U, number 92, protons: 92
What happens to the number of protons when U-238 emits an alpha particle?
When U-238 emits an alpha particle, it loses two protons. This results in the atom transforming into a different element (Th-234) which has two fewer protons in the nucleus.
What chemical symbol is the symbol for uranium and how many protons does it have?
The chemical symbol of uranium is U; uranium has 92 protons.
What is the atomic number of a helium atom?
The atomic number of Helium is 2 because there are 2 protons and 2 electrons.
What is changed during nuclear change?
The make up of the nucleus concerned, ie the number of protons and/or neutrons. In the case of fission of for example U-235, two completely different fragments of the U nucleus are formed, with the same total number of protons (92) but fewer neutrons because some are emitted in the fission.
Which quantity identifies an element?
the atom number identifies the element u puta
Is the mass number an average of the masses of all naturally occurring isotopes of an element?
No, it isn't. It is the atomic weight that is a weighted average of the mass of each of the naturally occurring isotopes of an element. The mass number, or A, is the number of protons and neutrons (the so-called nucleons) in the nucleus of an atom of an element. The atomic number, or Z, is the number of protons in the nucleus of an element.
Definition of atomic number?
if u mean the atomic number of a chemical element it is the number of electrons and protons it has the other number is the number of neutrons e.g ununoctium number 118 is the atomic number the other number i think is 7
What is the symbol atomic number and atomic mass for krypton?
The atomic number of krypton is 36, and its atomic weight from the periodic table is 83.798. Refer to the related links for a printable periodic table.
What is the chemical formula of uranium yellowcake?
Uranium has the atomic number 92 and the atomic mass 238. This mean the makeup of uranium is that is has 92 protons and 146 neutrons in the nucleus and it has 92 electrons outside the nucleus.
