A fullerene molecule, depicted in the image above, consists of a large number of carbon atoms in a polyhedral shape – with a 60 carbon structure being particularly stable. It was found that noble gas atoms can be “caged” inside a buckminsterfullerene molecule. XeF 2, XeF 4, and XeF 6 all appeared shortly after the first xenon compound was announced. Since then, many compounds of xenon have been formed, along with some compounds of krypton, and with much difficulty, argon fluorohydride – HArF. Interestingly, it was a mustard yellow solid compound. In 1962, Neil Bartlett used platinum hexafluoride to form a compound between xenon, platinum, and fluorine – xenon hexafluoroplatinate, Xe. Linus Pauling predicted in 1933 that xenon and krypton could form compounds, and he was correct. However, it is quite difficult to get xenon and krypton to form compounds. Xenon can form several compounds with fluorine. We now know that is incorrect, in fact, the further down the group you go, the more reactive the noble gases get. Rendition by Hugo Alejandro Jimenez Vazquez Noble Gas Chemistryįor a long time, chemists thought that these gases could not bond with other elements. Noble gas atom held within a buckminsterfullerene molecule, which is 60 carbon atoms. It is also now known that many of the gases are not completely inert. Helium is the second most abundant element in the universe, after hydrogen. We now know that several of these elements are quite abundant on earth. The phrase noble gas comes from the German world Edelgas, used first in 1898 by Hugo Erdmann, the same year radon was first identified. Originally these elements were called inert gases, or rare gases. German chemist Friedrich Ernst Dorn discovered radon soon after in 1900, initially naming it niton. In the following three years, Ramsay would go on to discover helium, neon, krypton, and xenon. They had not predicted any elements could lie between the halogens and the alkali metals. When Lord Rayleigh and William Ramsay discovered argon in 1895, they surprised the scientific world. It may also be a noble gas, but because scientists can only synthesize it for brief periods of time its properties are still largely unknown. A potential addition to the list appeared on the scene in 2006, when researchers at the Joint Institute for Nuclear Research in Russia synthesized Oganesson, atomic number 118. The list of all noble gases includes helium, neon, argon, krypton, xenon, and radon. Each of the noble gases (except radon) and their characteristic glow with an electrical discharge. Argon glows blue, and krypton glows a whitish purple. Each noble gas glows a different color: for example, neon is reddish orange, like in neon signs. If an electrical discharge passes through a noble gas at low pressure, the gas will glow, as seen in the image below. This is because they easily emit electromagnetic radiation.

Noble gases are often used in fluorescent lighting and discharge lamps. Radon is a product of the radioactive decomposition of radium compounds. Xenon is an anesthetic, albeit a costly one. Both helium and neon are used as cryogenic refrigerants. Argon is used in incandescent lamps, and neon is used in signs. Most helium comes from natural gas, and some people worry that we may run out of helium one day. Helium’s uses include blimps and balloons, as well as deep-sea diving (aka technical diving), mixed with oxygen. Helium is the only element that will not freeze at atmospheric pressure, no matter how low the temperature. Unlike the halogens, noble gases are monatomic, meaning that they do not form molecules of multiple atoms – each “molecule” of the gas is just a single atom. They are all very close to being ideal gases. The noble gases all have very low melting and boiling points, due to their weak intermolecular forces.

Because of their nonreactivity, one organic chemist even referred to them as the “lazy elements.” However, Neil Bartlett showed us another side to these elements in 1962 by discovering a compound of xenon. These monatomic gases also conduct electricity and can fluoresce. The noble gases are tasteless, odorless, colorless, nonflammable, and mostly nonreactive. Most of this argon in the air arises from the decay of radioactive potassium-40. In fact, air is 0.934% argon, while the other group 18 elements are present in much smaller quantities. They are members of group 18, the last group on the periodic table.Īll of the noble gases occur in the atmosphere. The noble gases are a group of six inert (nonreactive) gases on the far right side of the periodic table.

Color code groups on periodic table