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Indium (49 In) consists of two primordial nuclides, with the most common (~ 95.7%) nuclide (115 In) being measurably though weakly radioactive. Its spin-forbidden decay has a half-life of 4.41×10 14 years, much longer than the currently accepted age of the Universe. The stable isotope 113 In is only 4.3% of
Indium has 39 known isotopes, ranging in mass number from 97 to 135. Only two isotopes occur naturally as primordial nuclides: indium-113, the only stable isotope, and indium-115, which has a half-life of 4.41 × 10 14 years, four orders of magnitude greater than the age of the Universe and nearly 30,000 times greater than half life of thorium ...
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While Indium-115 is very slightly radioactive, its half life is longer than the age of the universe and indeed a typical sample of Indium on earth will contain more of this "unstable" isotope than of "stable" Indium-113.
Because all their atomic numbers are odd, boron, gallium and thallium have only two stable isotopes, while aluminium and indium are monoisotopic, having only one, although most indium found in nature is the weakly radioactive 115 In. 10 B and 11 B are both stable, as are 27 Al, 69 Ga and 71 Ga, 113 In, and 203 Tl and 205 Tl. [23]
The oxides of indium in its preferred oxidation state of +3, namely In 2 O 3 and In(OH) 3 are weakly amphoteric; it forms anionic indates in strongly basic solutions. [112] Indium forms Zintl phases such as LiIn, Na 2 In and Rb 2 In 3. [113] Indium does not oxidize in air at ambient conditions. [109]
About Wikipedia; Contact us; Contribute Help; ... 113 lead-206m1: 125 thorium-216m1: 137 curium-248m: ... indium-115: 441 13.9 10 15 years 10 21 seconds
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