યુરેનિયમ: આવૃત્તિઓ વચ્ચેનો તફાવત

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નવું પાનું : {{ભાષાંતર}} '''યુરેનિયમ''' એ એક ચળકતી-સફેદ રાસાયણિક તત્વ છે in the [[actinide]...
 
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'''યુરેનિયમ''' એ એક ચળકતી-સફેદ [[રાસાયણિક તત્વ]] છે in theતેનો [[actinideઅણુ ક્રમાંક]] series૯૨ ofછે theઅને [[periodicતે table]],એક્ટિનાઈડ withશ્રેણીનો [[atomic number]]તત્વ 92છે. Itઆની isસંજ્ઞા assigned the [[chemical symbol]] '''U''' છે. A uranium atomતત્વ has૯૨ 92પ્રોતોન [[proton]]sઅને and૯૨ 92ઇલેક્ટ્રોન [[electron]]s,ધરાવે ofછે whichજેમાં 6 areબંધનાંક [[valenceઇલેક્ટ્રોન electron]]sછે. યુરેનોયમ અણુની નાભિ કે કેંદ્રમાં ૧૪૧ થે લઈને ૧૪૬ ન્યૂટ્રોન હોય છે. The uranium nucleus binds between 141 and 146 [[neutron]]s, establishing six isotopes (U-233 through U-238), the most common of which are [[uranium-238]] (146 neutrons) and [[uranium-235]] (143 neutrons). All [[isotopes]] are unstable and uranium is weakly [[radioactive decay|radioactive]]. Uranium has the second highest [[atomic weight]] of the naturally occurring elements, lighter only than [[plutonium-244]].<ref>{{cite journal |doi = 10.1038/234132a0 |url=http://www.nature.com/nature/journal/v234/n5325/abs/234132a0.html |title= Detection of Plutonium-244 in Nature |journal = Nature |pages = 132–134 |year = 1971 |last1 = Hoffman |first1 = D. C. |last2 = Lawrence |first2 = F. O. |last3 = Mewherter |first3 = J. L. |last4 = Rourke |first4 = F. M. |volume = 234 |issue=5325 |bibcode = 1971Natur.234..132H}}</ref> Its [[density]] is about 70% higher than that of [[lead]], but not as dense as [[gold]] or [[tungsten]]. It occurs naturally in low concentrations of a few [[Parts-per notation#Parts-per expressions|parts per million]] in soil, rock and water, and is commercially [[uranium mining|extracted]] from uranium-bearing [[mineral]]s such as [[uraninite]].
 
[[Natural uranium|In nature]], uranium is found as uranium-238 (99.2742%), uranium-235 (0.7204%), and a very small amount of [[uranium-234]] (0.0054%). Uranium decays slowly by emitting an [[alpha particle]]. The [[half-life]] of uranium-238 is about 4.47 [[1000000000 (number)|billion]] years and that of uranium-235 is 704 [[million]] years,<ref>{{cite web |url=http://ie.lbl.gov/toi/nucSearch.asp |title=WWW Table of Radioactive Isotopes}}</ref> making them useful in dating the [[age of the Earth]].