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Competition experiment between SN2 and E2. With ethyl bromide, the reaction product is predominantly the substitution product. As steric hindrance around the electrophilic center increases, as with isobutyl bromide, substitution is disfavored and elimination is the predominant reaction. Other factors favoring elimination are the strength of the ...
Argon's complete octet of electrons indicates full s and p subshells. This full valence shell makes argon very stable and extremely resistant to bonding with other elements. Before 1962, argon and the other noble gases were considered to be chemically inert and unable to form compounds; however, compounds of the heavier noble gases have since ...
Stargazing Live is a British live television programme on astronomy that was broadcast yearly on BBC Two over three nights every winter from 2011 to 2017. The series was primarily presented by scientist Brian Cox and comedian and amateur astronomer Dara Ó Briain with support from TV presenter and biochemist Liz Bonnin and astronomer Mark Thompson.
For instance, argon, krypton, and xenon form clathrates with hydroquinone, but helium and neon do not because they are too small or insufficiently polarizable to be retained. [61] Neon, argon, krypton, and xenon also form clathrate hydrates, where the noble gas is trapped in ice. [62] An endohedral fullerene compound containing a noble gas atom
In 2006, with full results published in 2008, the team provided results from a reaction involving the bombardment of a natural germanium target with uranium ions: 238 92 U + nat 32 Ge → 308, 310, 311, 312, 314 124* → fission. The team reported that they had been able to identify compound nuclei fissioning with half-lives > 10 −18 s.
Argon is also very miscible in solid nitrogen. [57] For compositions of argon and nitrogen with 60% to 70% nitrogen, the hexagonal form remains stable to 0 K. [58] A van der Waals compound of xenon and nitrogen exists above 5.3 GPa. [57] A van der Waals compound of neon and nitrogen was shown using Raman spectroscopy. [57]
Saturday Night Live is one of the longest-running network programs in American television history, with more than 900 episodes broadcast over five decades. A number of the show's sketches have been developed into feature films , including The Blues Brothers , Wayne's World , A Night at the Roxbury , Superstar , Coneheads , It's Pat , The Ladies ...
36 Ar, in the form of argon hydride, was detected in the Crab Nebula supernova remnant during 2013. [9] [10] This was the first time a noble molecule was detected in outer space. [9] [10] 37 Ar is a synthetic radionuclide that is created via neutron capture of 40 Ca followed by alpha particle emission, as a result of subsurface nuclear ...