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There are 39 known isotopes and 17 nuclear isomers of tellurium (52 Te), with atomic masses that range from 104 to 142. These are listed in the table below. Naturally-occurring tellurium on Earth consists of eight isotopes. Two of these have been found to be radioactive: 128 Te and 130 Te undergo double beta decay with half-lives of, respectively, 2.2×10 24 (2.2 septillion) years (the longest ...
The other two, 128 Te and 130 Te, are slightly radioactive, [17] [18] [19] with extremely long half-lives, including 2.2 × 10 24 years for 128 Te. This is the longest known half-life among all radionuclides [ 20 ] and is about 160 trillion (10 12 ) times the age of the known universe .
The telluride ion is the anion Te 2− and its derivatives. It is analogous to the other chalcogenide anions, the lighter O 2−, S 2−, and Se 2−, and the heavier Po 2−. [1] In principle, Te 2− is formed by the two-e − reduction of tellurium. The redox potential is −1.14 V. [2] Te(s) + 2 e − ↔ Te 2−
2, Te(OTeF 5) 4 and Te(OTeF 5) 6. [4] The square antiprismatic anion TeF 2− 8 is also attested. [5] The other halogens do not form halides with tellurium in the +6 oxidation state, but only tetrahalides (TeCl 4, TeBr 4 and TeI 4) in the +4 state, and other lower halides (Te 3 Cl 2, Te 2 Cl 2, Te 2 Br 2, Te 2 I and two forms of TeI).
On 16 February 2022 Chief of Staff for Regional Territorial Defense Command of Operational Command East Yevhen Shcherban announced that a second brigade dedicated to defense of Dnipro will be created. [2] Command of the unit was offered to Colonel Oleksandr Vodolazskyi on the 25th. Next day, 26 February the brigade was formed and began recruiting.
The original 1.3 L (1,290 cc) 128/X1/9 engine is the only one of the family to have used the 86 mm (3.4 in) bore. The second generation used bores of either 80 or 86.4 mm (3.15 or 3.40 in) with strokes of 55.5 or 63.9 mm (2.19 or 2.52 in) giving four possible engine capacities. [3] The final generation of SOHC engines standardised on a longer ...
The military designation of the interceptor was at first Tu-28, but it was changed in 1963 to Tu-128, identical to the designation used by the OKB. [1] [2] [5] The Tu-128 had a broad, low/mid-mounted swept wing carrying the main landing gear in wing-mounted pods, and slab tailplanes. Two Lyulka AL-7F-2 turbojet engines [1] [2] were mounted in ...
The sum of Euler's totient function φ(x) over the first twenty integers is 128. [4] 128 can be expressed by a combination of its digits with mathematical operators, thus 128 = 2 8 − 1, making it a Friedman number in base 10. [5] A hepteract has 128 vertices. 128 is the only 3-digit number that is a 7th power (2 7).