|Group||18||Melting point||-189.34 oC, -308.81 oF, 83.81 K|
|Period||3||Boiling point||-185.848 oC, -302.526 oF, 87.302 K|
|Block||p||Density (g cm-3)||0.001633|
|Atomic number||18||Relative atomic mass||39.948|
|State at 20°C||Gas||Key isotopes||40Ar|
|Electron configuration||[Ne] 3s23p6||CAS number||7440-37-1|
|ChemSpider ID||22407||ChemSpider is a free chemical structure database|
Argon is a colourless, odourless gas that is totally inert to other substances.
Argon is used in fluorescent tubes and low-energy light bulbs. A low-energy light bulb often contains argon gas and mercury. When it is switched on an electric discharge passes through the gas, generating UV light. The coating on the inside surface of the bulb is activated by the UV light and it glows brightly.
Double-glazed windows use argon to fill the space between the panes. The tyres of luxury cars can contain argon to protect the rubber and reduce road noise.
Argon makes up 0.94% of the Earth’s atmosphere and is the third most abundant atmospheric gas. Levels have gradually increased since the Earth was formed because radioactive potassium-40 turns into argon as it decays. Argon is obtained commercially by the distillation of liquid air.
Although argon is abundant in the Earth’s atmosphere, it evaded discovery until 1894 when Lord Rayleigh and William Ramsay first separated it from liquid air. In fact the gas had been isolated in 1785 by Henry Cavendish who had noted that about 1% of air would not react even under the most extreme conditions. That 1% was argon.
Argon was discovered as a result of trying to explain why the density of nitrogen extracted from air differed from that obtained by the decomposition of ammonia.
Ramsay removed all the nitrogen from the gas he had extracted from air, and did this by reacting it with hot magnesium, forming the solid magnesium nitride. He was then left with a gas that would not react and when he examined its spectrum he saw new groups of red and green lines, confirming that it was a new element.
|Listen to Argon Podcast|
Chemistry in Its Element - Argon
You're listening to Chemistry in its element brought to you by Chemistry World, the magazine of the Royal Society of Chemistry
Hello, this week the element that's so indolent that scientists at one time thought it wouldn't react with anything, but in the chemical world laziness can have its advantages especially if it's super quiet car tyres or a safe chemical with which to pump up your diving suit that you're after.
Here's John Emsley.
It's lazy, it's hard-working, it's colourless, it's colourful - it's argon!
Argon's name comes from the Greek word argos meaning lazy and indeed for more than a hundred years after its discovery chemists were unable to get it to combine with any other elements. But in the year 2000, chemists at the University of Helsinki led by Markku Räsänen announced the first ever compound: argon fluorohydride. They made it by condensing a mixture of argon and hydrogen fluoride on to caesium iodide at -265oC and exposing it to UV light. On warming above just -246oC it reverted right back to Argon and hydrogen fluoride. And no other process has ever induced argon to react - [a truly lazy element].
There are 50 trillion tonnes of argon swirling around in the Earth's atmosphere and this has slowly built-up over billions of years, almost all coming from the decay of the radioactive isotope potassium-40 which has a half-life of 12.7 billion years. Although argon makes up 0.93% of the atmosphere it evaded discovery until 1894 when the physicist Lord Rayleigh and the chemist William Ramsay identified it. In 1904 Rayleigh won the Nobel Prize for Physics and Ramsay won the Nobel Prize for Chemistry for their work.
The story of its discovery started when Rayleigh found that the nitrogen extracted from the air had a higher density than that made by decomposing ammonia. The difference was small but real. Ramsay wrote to Rayleigh suggesting that he should look for a heavier gas in the nitrogen got from air, while Rayleigh should look for a lighter gas in that from ammonia. Ramsay removed all the nitrogen from his sample by repeatedly passing it over heated magnesium, with which nitrogen reacts to form magnesium nitride. He was left with one percent which would not react and found it was denser than nitrogen. Its atomic spectrum showed new red and green lines, confirming it a new element. Although in fact it contained traces of the other noble gases as well.
Argon was first isolated in 1785 in Clapham, South London, by Henry Cavendish. He had passed electric sparks through air and absorbed the gases which formed, but he was puzzled that there remained an unreactive 1%. He didn't realise that he had stumbled on a new gaseous element.
Most argon goes to making steel where it is blown through the molten iron, along with oxygen. Argon does the stirring while the oxygen removes carbon as carbon dioxide. It is also used when air must be excluded to prevent oxidation of hot metals, as in welding aluminium and the production of titanium to exclude air. Welding aluminium is done with an electric arc which requires a flow of argon of at 10-20 litres per minute. Atomic energy fuel elements are protected with an argon atmosphere during refining and reprocessing.
The ultra-fine metal powders needed to make alloys are produced by directing a jet of liquid argon at a jet of the molten metal.
Some smelters prevent toxic metal dusts from escaping to the environment by venting them through an argon plasma torch. In this, argon atoms are electrically charged to reach temperatures of 10 000 °C and the toxic dust particles passing through it are turned into to a blob of molten scrap.
For a gas that is chemically lazy argon has proved to be eminently employable. Illuminated signs glow blue if they contain argon and bright blue if a little mercury vapour is also present. Double glazing is even more efficient if the gap between the two panes of glass is filled with argon rather than just air because argon is a poorer conductor of heat. Thermal conductivity of argon at room temperature (300 K) is 17.72 mW m-1K-1 (milliWatts per metre per degree) whereas for air it is 26 mW m-1K-1.For the same reason argon is used to inflate diving suits. Old documents and other things that are susceptible to oxidation can be protected by being stored in an atmosphere of argon. Blue argon lasers are used in surgery to weld arteries, destroy tumors and correct eye defects.
The most exotic use of argon is in the tyres of luxury cars. Not only does it protect the rubber from attack by oxygen, but it ensures less tyre noise when the car is moving at speed. Laziness can prove useful in the case of this element. Its high tech uses range from double glazing and laser eye surgery to putting your name in lights.
John Emsley unlocking the secrets of the heavier than air noble gas Argon. Next week, would you marry this man?
It's almost never the case where the popular elements are that way because of their utility and interesting chemistry. But for Gold and Silver it's all so superficial. They are more popular because they're prettier. My wife for example, a non chemist, wouldn't dream of wearing a copper wedding ring. That might have something to do with the fact that copper oxide has an annoying habit of dyeing your skin green. But if she only took the time to learn about copper, to get to know it some; maybe then she would be likely to turn her back on the others and wear it with pride.
Steve Mylon's back to cross your palm with copper on next week's Chemistry in its Element, I hope you can join us. I'm Chris Smith, thank you for listening and goodbye.
Chemistry in its elementis brought to you by the Royal Society of Chemistry and produced by thenakedscientists dot com. There's more information and other episodes of Chemistry in its element on our website at chemistryworld dot org forward slash elements.
Mining and Sourcing data: British Geological Survey – natural environment research council.
Text: John Emsley Nature’s Building Blocks: An A-Z Guide to the Elements, Oxford University Press, 2nd Edition, 2011.
Additional information for platinum, gold, neodymium and dysprosium obtained from Material Value Consultancy Ltd www.matvalue.com
Data: CRC Handbook of Chemistry and Physics, CRC Press, 92nd Edition, 2011.
G. W. C. Kaye and T. H. Laby Tables of Physical and Chemical Constants, Longman, 16th Edition, 1995.
Members of the RSC can access these books through our library.