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92, the atomic number of U.
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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
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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 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 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.
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 substance of copper?
Copper is an element... Which means that it is pure and can not be broken down into other substances. The Atomic Number of Copper is 29 (29 protons in nucleus) And the Atomic/Chemical Symbol is Cu (Capital C, little U)
What is the symbol for the nucleus of each isotope of uranium?
The symbol for all the isotopes of uranium is U. A number is added after U - the atomic mass of a specific isotope; for example U-235, U-240, etc.
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.
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
How many neutrons are in uranium-235 and uranium-238 respectively?
The element uranium (U) has 92 protons in its nucleus. That's where its atomic number comes from. When we see an isotope of an element written in "standard" form, the element name or symbol will be followed by the atomic mass (atomic weight) of the isotope. This number is basically the number of protons and neutrons (called nucleons when they are in an atomic nucleus) in an atom. In this case, we have U-235 and U-238. In the first case, 235 - 92 = 143, so U-235 has 143 neutrons. In the second case, 238 - 92 = 146, so U-238 has 146 neutrons. See the Related Questions below for how to find the number of neutrons in any atom.
What does the symbol U in chemistry mean and has 92 protons?
Uranium
How do you calculate number of electrons required for the reaction?
For each element, the number of protons it has is equal to the number of electrons it has. However, if the atom has a different amount of electrons, then the charge will tell you that. If the charge is negative (-) then that says how many electrons the atom has gained, and if the charge is positive (+) then that says how many electrons the atom has lost.
What is gold mass number?
The only stable, and only naturally-occurring isotope of gold has mass number of 197. This is the number of protons and neutrons in each nucleus. Gold's atomic number is 79. This is the number of protons found in each gold atom. This determines its place in the periodic table, and its chemical properties: it is the defining property of gold. A nucleus with a different number of neutrons and the same 79 protons would be a different isotope with a different mass number; a nucleus with a different number of protons would not be gold, but some other element.
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.
