Its atomic weight is 238
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Atomic weight | Define Atomic weight at Dictionary.com  Atomic weight definition, the average weight of an atom of an element, formerly ... Thus from uranium with an atomic weight of 238 to radium there is a loss of three ... Its atomic weight has been determined by several careful investigators and is...
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periodic table - How come uranium's relative atomic mass is 238.03 ...  May 28, 2015 ... How then can uranium's relative atomic mass exceed 238? ... of uranium with greater masses than 238 - though their contribution would be tiny.
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What atomic weight equals 238? - Quora  Erm. It could be one of many different isobars. See the interactive chart of the nuclides: ... What's the number of oxygen atoms in ozone having a weight equal to its vapour density? What is the atomic weight of carbon? What is the difference...
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atom: Atomic Weight and Number - Infoplease  The atomic number of an atom is simply the number of protons in its nucleus. ... the isotopes of uranium with atomic weights 235 and 238 are indicated by 23592...
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What is atomic mass unit (AMU or amu)? - Definition from WhatIs.com  An atomic mass unit (symbolized AMU or amu) is defined as precisely 1/12 the ... The carbon-12 (C-12) atom has six protons and six neutrons in its nucleus. ... an AMU of approximately 235, while uranium-238 (U-238) is slightly more massive.
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Periodic Table of Elements  It is silvery in appearance and is the second lightest metal. ... the form of Potash, but it is also Atomic Number: 19 Symbol: K Atomic Weight: 39.0983 Melting ... A possible ion propulsion fuel, one pound will theoretically propel a spacecraft one ..... It is a silvery- white, malleable, ductile metal soft enough to be cut with a knife.
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Relative atomic mass - Wikipedia  Relative atomic mass (symbol: Ar) is a dimensionless physical quantity, the ratio of the average .... An atomic weight (relative atomic mass) of an element from a specified ... has a lower relative atomic mass than boron from California, because of its ... The calculation is exemplified for silicon, whose relative atomic mass is...
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Geologic Time: Radiometric Time Scale  Jun 13, 2001 ... The discovery of the natural radioactive decay of uranium in 1896 by Henry Becquerel, ... loses particles from its nucleus to form an isotope of a new element (the daughter). ... Potassium-40, Argon-40, 1.25 billion years ... on the radioactive decay of the isotope carbon-14, which has a half-life of 5,730 years.
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Cobalt - Wikipedia  Cobalt is a chemical element with symbol Co and atomic number 27. Like nickel, cobalt is ... Cobalt-based blue pigments (cobalt blue) have been used since ancient times for jewelry .... The primary decay products before 59Co are element 26 (iron) isotopes and the primary products after are element 28 (nickel) isotopes.
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Strontium - Wikipedia  Strontium is a chemical element with symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white or yellowish metallic element that is highly reactive chemically. The metal turns yellow when it is exposed to air. Strontium has physical and chemical properties similar to those of its two ... Strontium is a gray, silvery metal that is softer than calcium and even more...
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Thorium - Wikipedia  Thorium is a chemical element with symbol Th and atomic number 90. A radioactive actinide ... Thorium is weakly radioactive: all its known isotopes are unstable. .... by uranium (element 92): the isotope 232Th has a half-life of 14.05 billion years, ... 228Th with a half-life of 1.92 years, 234Th with a half-life of 24.10 days, and...
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Atomic masses - Revolvy  The atomic mass or relative isotopic mass refers to the mass of a single particle, ... This corresponds to the fact that nuclear fission in an element heavier than ..... Copper ( Cu ) has two stable isotopes, Cu and Cu, along with 27 radioisotopes. ... Cu 29 23 51.99718(28)# p Ni (3+)# Cu 29 24 52.98555(28)# p Ni (3/2)# Cu 29...
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rutherfordium (Rf) | chemical element | Britannica.com  Alternative Titles: element 104, Ku, kurchatovium, Rf, unnilquadium, Unq ... transuranium element in Group IVb of the periodic table, atomic number 104. ... discovery of element 104, which they named kurchatovium, symbol Ku (for Igor Kurchatov, ... the name rutherfordium, in honour of the British physicist Ernest Rutherford.
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Chemistry for Kids: Elements - Iron - Ducksters  Kids learn about the element iron and its chemistry including atomic weight, ... Symbol: Fe; Atomic Number: 26; Atomic Weight: 55.845; Classification: Transition metal ... up about 5% of the Earth's crust where it is the fourth most abundant element. ... The most important iron alloys include cast iron, pig iron, wrought iron, and...
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Atomic number 13 - The Free Dictionary  Noun 1. atomic number 13 - a silvery ductile metallic element found primarily in ... alum, ammonia alum, ammonium alum - a white crystalline double sulfate of...
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Nucleons and Isotopes Homework  _____1) One atomic mass unit is defined as weighing a) 1/16 the mass of O-16 b) 1/12 the mass of C-12 c) 1/32 the mass of S-32 d) 1/10 ... 42. 20Ca. 56. 26Fe. 232. 92U. C) Find the most common isotope for each of the following elements:...
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Chemical Elements.com - Dysprosium (Dy)  Name: Dysprosium Symbol: Dy Atomic Number: 66. Atomic Mass: 162.5 amu. Melting Point: 1412.0 C (1685.15 K, 2573.6 F) Boiling Point: 2562.0 C (2835.15...
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Uranium - Periodic Table of Elements: Los Alamos National ...  Yellow glass with 1% uranium oxide was found in an ancient Roman villa near ... The decay series ofU, which is called the actinium series has 15 members, all of ... is a silvery white, weakly radioactive metal, which is harder than most elements. ... Another fissile isotope, uranium-233, can be produced from natural thorium...
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Physics - Ray Sahelian, M.D.  Some breeder reactors produce Neptunium, along with this radioactive metal whose atomic number is 94. Pulsar radio signal emitting star. Photo quantum of...
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Gallium - Wikipedia  Gallium is a chemical element with symbol Ga and atomic number 31. It is in group 13 of the ..... He named the element "gallia", from Latin Gallia meaning Gaul, after his ... gallium after himself: "Le coq" is French for "the rooster" and the Latin word ... Originally, de Boisbaudran determined the density of gallium as 4.7 g/cm3,...
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Bismuth - Wikipedia  Bismuth is a chemical element with the symbol Bi and the atomic number 83. Bismuth, a ... Nickel (transition metal) ..... Commercially, the radioactive isotope bismuth-213 can be produced by bombarding radium with .... It is also a strong fluoride acceptor, reacting with xenon tetrafluoride to form the XeF+ 3 cation: BiF 5 + XeF