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Difluorocarbene is the chemical compound with formula CF 2. It has a short half-life , 0.5 and 20 ms, in solution and in the gas phase, respectively. [ 1 ] Although highly reactive, difluorocarbene is an intermediate in the production of tetrafluoroethylene , which is produced on an industrial scale as the precursor to Teflon ( PTFE ).
The structure of fluorographene can be derived from the structure of graphite monofluoride (CF) n, which consists of weakly bound stacked fluorographene layers, and its most stable conformation (predicted for the monocrystal) contains an infinite array of trans-linked cyclohexane chairs with covalent C–F bonds in an AB stacking sequence. [7]
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Californium (98 Cf) is an artificial element, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no stable isotopes. The first isotope to be synthesized was 245 Cf in 1950. There are 20 known radioisotopes ranging from 237 Cf to 256 Cf and one nuclear isomer, 249m Cf.
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252 Cf is a very strong neutron emitter, which makes it extremely radioactive and harmful. [24] [25] [26] 252 Cf, 96.9% of the time, alpha decays to curium-248; the other 3.1% of decays are spontaneous fission. [11] One microgram (μg) of 252 Cf emits 2.3 million neutrons per second, an average of 3.7 neutrons per spontaneous fission. [27]
Carbon is stable in a fluorine atmosphere up to about 400 °C, but between 420-600 °C a reaction takes place to give substoichiometric carbon monofluoride, CF 0.68 appearing dark grey. With increasing temperature and fluorine pressure stoichiometries up to CF 1.12 are formed. With increasing fluorine content the colour changes from dark grey ...
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