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Argon is a chemical element; it has symbol Ar and atomic number 18. It is in group 18 of the periodic table and is a noble gas. [10] Argon is the third most abundant gas in Earth's atmosphere, at 0.934% (9340 ppmv).
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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 ...
For example, N 2, the diatomic form of nitrogen, is used as an inert gas in situations where using argon or another noble gas would be too expensive. Formation of multiple bonds is facilitated by their five valence electrons , as the octet rule permits a pnictogen to accept three electrons on covalent bonding.
The discovery of the noble gases aided in the development of a general understanding of atomic structure. In 1895, French chemist Henri Moissan attempted to form a reaction between fluorine, the most electronegative element, and argon, one of the noble gases, but failed. Scientists were unable to prepare compounds of argon until the end of the ...
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A period 3 element is one of the chemical elements in the third row (or period) of the periodic table of the chemical elements.The periodic table is laid out in rows to illustrate recurring (periodic) trends in the chemical behavior of the elements as their atomic number increases: a new row is begun when chemical behavior begins to repeat, meaning that elements with similar behavior fall into ...