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HFC-125 is a non-ozone depleting replacement for chlorine- or bromine-containing chemicals such as Halon 1301. Due to its global warming potential (GWP) of 3500 times that of CO₂ and atmospheric lifetime of 29 years, it is included in the list of controlled substances of the Montreal Protocol .
The YouTube channel is now one of the most popular chemistry related channels on all of YouTube. [7] The producers of the videos have received praise from Nobel Laureates, chemistry professors, and the general public, says Professor Poliakoff. [5] Chemistry Nobel Laureate Roald Hoffmann has even offered his praise of the videos, stating they ...
The detailed decay mechanism to form the stable daughter nuclide tellurium-125 is a multi-step process that begins with electron capture, which produces a tellurium-125 nucleus in an excited state with a half-life of 1.6 ns. The excited tellurium-125 nucleus may undergo gamma decay, emitting a gamma photon at 35.5 keV, or undergo internal ...
Of the 94 natural elements, eighty have a stable isotope and one more has an almost-stable isotope (with a half-life of 2.01×10 19 years, over a billion times the age of the universe). [ 15 ] [ b ] Two more, thorium and uranium , have isotopes undergoing radioactive decay with a half-life comparable to the age of the Earth .
They considered elements 158 through 164 to be homologues of groups 4 through 10, and not 6 through 12, noting similarities of electron configurations to the period 5 transition metals (e.g. element 159 7d 4 9s 1 vs Nb 4d 4 5s 1, element 160 7d 5 9s 1 vs Mo 4d 5 5s 1, element 162 7d 7 9s 1 vs Ru 4d 7 5s 1, element 163 7d 8 9s 1 vs Rh 4d 8 5s 1 ...
This is an accepted version of this page This is the latest accepted revision, reviewed on 4 February 2025. American vlogger and entrepreneur (born 1980) This article is about the American vlogger and entrepreneur. For other people, see Henry Green (disambiguation). Hank Green Green in 2023 Born William Henry Green II (1980-05-05) May 5, 1980 (age 44) Birmingham, Alabama, U.S. Alma mater ...
[125] [126] 1998-01-25 N.N. 68 Ludwigshafen: Rheinland-Pfalz Several passerby alert police that they had been shot at by someone inside a nearby apartment building. When officers knocked on the door of the flat in question, the man opening it immediately fired at them with a blank gun. One officer then fatally shot the man. [125] [127] 1998-01 ...
Quizlet was founded in October 2005 by Andrew Sutherland, who at the time was a 15-year old student, [2] and released to the public in January 2007. [3] Quizlet's primary products include digital flash cards, matching games, practice electronic assessments, and live quizzes. In 2017, 1 in 2 high school students used Quizlet. [4]