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An isotope means an atom with the same amount of electrons and protons, but with different amount of neutrons.

Relative weight of a neutron is 1, a proton is 1, and an electron is very small. So weight of an atom is approx. mneutrons + m protons.

So, an uranium-235, as U is the 92th atom in Periodic Table, contains 92 protons, 92 electrons to be chargeless, and 143 (=235-92) neutrons.

An uranium-238, from the definition of isotope, contains 92 protons, 92 electrons, and 146 (=238-92) neutrons.

The difference is the 3 neutrons.

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12y ago
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12y ago

The atomic number of uranium is 92, which means that all uranium atoms have 92 protons in their nuclei. They differ in the number of neutrons. Atoms of U-235 have 92 protons and 143 neutrons in their nuclei. Atoms of U-238 have 92 protons and 146 neutrons in their nuclei.

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10y ago

Uranium-235 has 143 neutrons and uranium-238 has 146 neutrons.

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14y ago

Uranium 235 is fissionable with thermal neutrons, uranium 238 practically not. Some details at: http://nuclearweaponarchive.org/Library/Fission.html

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15y ago

U-238 has three neutrons more than U-235.

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Q: Uranium 235 and uranium 238 are isotope are chemically different why?
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Related questions

Depleted uranium is chemically thee same as natural uranium but?

Has had most of the uranium-235 (an isotope of uranium)) separated out of it.


How is uranium 235 different from uranium 231?

Uranium-235 is a natural isotope with 143 neutrons. Uranium-231 is an artificial isotope with 139 neutrons.


Is Uranium Chemically Active?

No uranium is not chemically active


What is the uranium isotope with 144 neutrons?

There is no uranium isotope with 234 neutrons. The questioner almost certainly meant the uranium isotope with 234 nucleons, which is a naturally occurring isotope U234 otherwise element 92, with 142 neutrons.In which case its half life would be 252,000 years.


The isotope of uranium used in nuclear reactors uranium-235 contains 92 protons Another isotope uranium-238 contains how many electrons?

All the isotopes of uranium contains 92 protons and electrons but a different number of neutrons.


What is a uranium atom?

Uranium atom has 92 protons and electrons; the number of neutrons is different for each isotope.


What does deutron bombardment of uranium isotope mean?

A nuclear reaction between an uranium isotope (e.g. uranium 238) and deuterons.


What is the atomic number of uranium and how many neutrons does the isotope uranium-235 have?

The atomic number of uranium is 92. The number of neutrons of the isotope uranium-235 is 143.


Is plutonium and enriched uranium the same thing?

Plutonium and enriched uranium are different materials.Enriched uranium is uranium with a concentration of the isotope 235U greater than the natural concentration of 0,7 %.


What is the percentage of uranium-235?

Uranium-235 is an isotope of uranium making up about 0.72% of natural uranium.


What is nuclear uranium?

Uranium-235 is the fissile isotope


What is the specific isotope of uranium?

Any isotope of uranium is specific. This notion don't exist.