Argon is neither flammable nor reactive. Argon is also used in incandescent, fluorescent lighting, and other gas-discharge tubes. , The main isotopes of argon found on Earth are 40Ar (99.6%), 36Ar (0.34%), and 38Ar (0.06%). Because cosmic rays lead to the creation of argonium, its abundance in interstellar space has also helped nail down the number of cosmic rays darting through the galaxy. Oxygen, along with nitrogen, hydrogen, and chlorine are made up of two atoms. A noble gas with the atomic symbol Ar, atomic number 18, and atomic weight 39.948. "Noble Gases". When argon is excited by a high voltage electric field it glows in a violet color. The answer is 39.948. Between locations in the Solar System, the isotopic composition of argon varies greatly. Argon-39 has been used for a number of ap…  Argon is also used in technical scuba diving to inflate a dry suit because it is inert and has low thermal conductivity. Oxygen has 6 valence electrons. High-purity chemicals and pharmaceuticals are sometimes packed and sealed in argon.. In the subsurface environment, it is also produced through neutron capture by 39K, followed by proton emission. , This article is about the chemical element. Where the major source of argon is the decay of 40K in rocks, 40Ar will be the dominant isotope, as it is on Earth.  Argon-36, in the form of argon hydride (argonium) ions, has been detected in interstellar medium associated with the Crab Nebula supernova; this was the first noble-gas molecule detected in outer space. Other uses; 1. Argon has electronic properties (ionization and/or the emission spectrum) desirable for some applications. Argon is a chemical element with symbol Ar and atomic number 18. This chemically inert element is colorless and odorless in both its liquid and gaseous forms. As a result, the underground Ar, shielded by rock and water, has much less 39Ar contamination. Argon compounds, the chemical compounds that contain the element argon, are rarely encountered due to the inertness of the argon atom. Neutrino experiments include ICARUS and MicroBooNE, both of which use high-purity liquid argon in a time projection chamber for fine grained three-dimensional imaging of neutrino interactions. Argon's complete octet of electrons indicates full s and p subshells. But there's no need to be alarmed: This colorless, odorless gas makes up a mere 0.94 percent of the air around you, and it's so nonreactive that it has no effect on living organisms such as humans. Argon is the third of the noble gases or inert gases. Argon – The First Noble Gas Molecules Discovered In Space There are only six of them: radon, helium, neon, krypton, xenon and the first molecules to be discovered in space – argon. Under standard conditions argon is an odorless and colorless gas. The difference was slight, but it was important enough to attract their attention for many months. The procedure carries a risk of producing gas embolism and has resulted in the death of at least one patient. This type of molecule is called a diatomic molecule, a molecule made from two atoms of the same type. Argon is colorless, odorless, nonflammable and nontoxic as a solid, liquid or gas. The noble gases (helium, neon, argon, krypton, xenon, and radon) are also gases at STP, but they are monatomic. Shuen-Chen Hwang, Robert D. Lein, Daniel A. Morgan (2005). Argon is monoatomic. Ask for details ; Follow Report by Raj6729 03.06.2019 Log in to add a comment What do you need to know? Argon has approximately the same solubility in water as oxygen and is 2.5 times more soluble in water than nitrogen. Argon is also used to form inert atmospheres for arc welding, growing semiconductor crystals and processes that require shielding from other atmospheric gases. In fact, although argonium is a molecule, it exists only in gas that’s 99.9 to 99.99 percent atomic. Nearly all of the argon in the Earth's atmosphere is radiogenic argon-40, derived from the decay of potassium-40 in the Earth's crust. Identify as element, compound, molecule or mixture: a. Coca-Cola – A mixture, because not all of it is chemically compound. Molecules of most elements are made up of only one of atom of that element. Argon is used in the poultry industry to asphyxiate birds, either for mass culling following disease outbreaks, or as a means of slaughter more humane than electric stunning. Non flammable cryogenics gases are sometimes referred to as inert gases. The homonuclear diatomic gases and noble gases together are called "elemental gases" or "molecular gases", to distinguish them from other gases that are chemical compounds. Theoretical calculation predicts several more argon compounds that should be stable but have not yet been synthesized. The main lithium compound is the lithium hydroxide. Wiley. , Argon is used as a propellant in the development of the Variable Specific Impulse Magnetoplasma Rocket (VASIMR). 343–383. The metastable ArCF2+2 dication, which is valence-isoelectronic with carbonyl fluoride and phosgene, was observed in 2010. Question: Which of the following is a molecular element? dinitrogen. On the other hand, its intrinsic beta-ray background is larger due to 39Ar contamination, unless one uses argon from underground sources, which has much less 39Ar contamination. Argon is used to displace oxygen- and moisture-containing air in packaging material to extend the shelf-lives of the contents (argon has the European food additive code E938). 4. Correspondingly, does Argon form any compounds? It is very non-reactive. Argon is a molecule. Classified as a noble gas, Argon is a gas at room temperature. Argon was first isolated from air in 1894 by Lord Rayleigh and Sir William Ramsay at University College London by removing oxygen, carbon dioxide, water, and nitrogen from a sample of clean air. Also, potassium–argon dating and related argon-argon dating is used to date sedimentary, metamorphic, and igneous rocks. Like all alkali metals, lithium reacts easily in water and does not occur freely in nature due to its activity, Lithium is a moderately abundant element and its present in The Earth's crust in 65 ppm (parts per million). Ask your question. Argon is produced industrially by the fractional distillation of liquid air. There are no known true chemical compounds that contain argon. However it was not widely recognised at that t… Nitrogen- chemical compound. Argon is sometimes used as the propellant in aerosol cans. In winemaking, argon is used in a variety of activities to provide a barrier against oxygen at the liquid surface, which can spoil wine by fueling both microbial metabolism (as with acetic acid bacteria) and standard redox chemistry. The predominance of radiogenic 40Ar is the reason the standard atomic weight of terrestrial argon is greater than that of the next element, potassium, a fact that was puzzling when argon was discovered. They concluded that there was another gas in the air mixed in with the nitrogen. Argon produced directly by stellar nucleosynthesis is dominated by the alpha-process nuclide 36Ar. The name "argon" is derived from the Greek word ἀργόν, neuter singular form of ἀργός meaning "lazy" or "inactive", as a reference to the fact that the element undergoes almost no chemical reactions. Argon fluorohydride (HArF), a compound of argon with fluorine and hydrogen that is stable below 17 K (−256.1 °C; −429.1 °F), has been demonstrated.