What is the nuclear half life of molybdenum?
438964
For the Molybdenum 93 Isotope (synthetic radioisotope) 4,000 years.\nFor the Molybdenum 99 Isotope (synthetic radioisotope) it is 65.94hours.\nFor the Molybdenum 100 Isotope it is 7.8x10^18 years.\nAll other Isotopes of Molybdenum (92,94,95,96,97) are stable Isotopes.
774612
The "half-life" of an element is important for determining the absolute age of a rock.\n\nThe answer is C.
461519
Francium is radioactive. Its most stable isotope has a half life of only 20 minutes or so. \nThis means that the only Francium present in the earth crust are those atoms that originated from other atoms having decayed. Francium has been detected in Uranium ores but the total quantity present at any time does not exceed 20 grams or so.
949985
Reactant, oxidation of molybdenum:\n\n2Mo(s) + 5Cl2(g) → 2MoCl5(s)\n\nProduct\n\nMoO3(s) + 3H2(g) ----> Mo(s) + 3H2O(g)
26543
There is 3 types of naturaly occuring isotopes for Uranium\n\nuranium-234 has a half life of 244 thousand years\nuranium-235 has a half life of 704 million years\nuranium-238 has a half life of 4.5 billion years\n\nIf you meant Fermium-253 then it is 3 days (Fermium is made by bombarding plutonium with neutrons)
208940
theres some  decay equation, i think. \nyou know that   the element   will have half the original after 40 days. so its like F = I (1/2)^d/40    i think. so d is the number of dayz and I is the initial.  so if d=40 dayz  youll have half  the original. \nanyways i might be wrong so sorry if i am but if im right, then u would put 100 for I (100%) and then put d=48 and find F.\nF = 100 (1/2)^(48/40)\nF = 100 (1/2)^1.2\nF = 43.52........   % of the original left after 48 days
608949
cant answer secifically, but you should be able to back calculte taking elements present today and using the half lives as your main variable.
798483
Here it is:\n\n(98,42)Mo + (1,0)n ---> (99,42)Mo
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211_____207_____4\n      Bi  -->__Tl +____a    (a helium nucleus) \n83_______81_____2
309925
Aluminum is element number 13, which means it has 13 protons.  the number of neutrons varies from isotope to isotope, but the most commonly occuring is also 13.  Aluminum in its ground state had 13 electrons.
240255
The definition of the half-life is the amount of time for half the substance to react.  \n\nWhen the last molecule (or atom) reacts, the reaction is complete.  One might argue that the half-life ends when the reaction ends.  However, for many reactions, the half-life is independent of the amount of that substance (a good example is  nuclear fission), so you could argue since the half-life doesn't change, it doesn't end.  This is really a matter of semantics.
745292
the definition of 1/2 life is that 1/2 of the material will be left after that amount of time.\n100 g to start, 50 g after 1 half life.\n25 g after 2 half lives.\n\nb) 60 yrs is 2 half lives.  see ans to part A)\nc) 25 g will be left after 60 yrs.  See answer to part A)\n-->
547737
kiki is right, and most other answers wrong. 'Decay' is only applied to radioactive elements, and not all elements are radioactive. Many have *isotopes* that are radioactive, but aren't the stable form of the element. For example, carbon 14 is radioactive carbon and decays; Carbon 13, the stable version, will never do so. \n\nStable elements can go through fusion or fission, effectively changing them into something else (for example, carbon fuses at about 600 million degrees K), but that is *not* decay, since decay involves *spontaneous* emission of radiation, and that event only involves external factors, like a star exploding, and is not a property of the element - so, again, that can't be called 'decay'.\n\nSo, no, not all elements decay over time, only the ones that have no stable isotope - all elements above 83, bismuth.
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Lawrencium is synthesized from californium and has no known uses.\n\nSeems you're out of luck.\n\nThere are apparently eleven isotopes but even the most stable isotope (Lawrencium-262) only has a half-life of 216 minutes (half of the sample will have decayed into another element in this time).\n\nIt decays into Nobelium via alpha emission, spontaneous fission and electron capture.\n\nThis short lived existance is most likely why there is no real use for the sustance other than for scientifical studying purposes.
915684
Very roughly:  by comparing the ratio between a radioisotope and its "daughter product", and with the knowledge of the radioisotope's half-life, calculate the amount of time needed for the observed ratio to develop.\n\nIn short, if there is a 50-50 split between the radioisotope and its daughter product, one half-life has passed.
27684
Protons, neutrons, and electrons.
629559
In Sweden - \n\n"Molybdenum was discovered by Carl Welhelm Scheele, a Swedish chemist, in 1778 in a mineral known as molybdenite (MoS2) which had been confused as a lead compound. Molybdenum was isolated by Peter Jacob Hjelm in 1781. Today, most molybdenum is obtained from molybdenite, wulfenite (PbMoO4) and powellite (CaMoO4). These ores typically occur in conjunction with ores of tin and tungsten. Molybdenum is also obtained as a byproduct of mining and processing tungsten and copper."