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ⓘ Noble gas compound. A noble gas compound is a chemical compound that has an element from Group 18 of the periodic table in them. Group 18 contains all the noble ..




                                     

ⓘ Noble gas compound

A noble gas compound is a chemical compound that has an element from Group 18 of the periodic table in them. Group 18 contains all the noble gases.

                                     

1. History

For a long time, scientists thought that noble gases could not form compounds because their valence electron shell had no space for more electrons. This means that they could not accept any more electrons, which made bonding impossible. However, in 1933, Linus Pauling said that heavy noble gases could react with fluorine or oxygen, as they are the most electronegative atoms. His prediction was correct, and xenon hexafluoride XeF 6 was later discovered. Many more noble gas compounds have been found since then.

                                     

2. Fullerene properties

Noble gases can also make endohedral fullerene compounds when the noble gas atom is pushed inside a fullerene molecule. In 1993, it was discovered that when C 60 is put under pressure of about 3 bar of Helium or Neon, He C 60 and Ne C 60 are made. Only about one out of every 650.000 C 60 were found with a helium atom. But with more pressures about 3000 bar, it is possible to get as much as 0.1%. Endohedral molecules with argon, krypton and xenon have also been made, as well as other compounds of He C 60.