Argon once in 1785 by Henry cavendish preparation, but has not been found that the elements, until 1894, when John William Stella, and Scottish chemist William ramsay was determined by experiment argon is a kind of new elements, they think should contain in the air to an unknown new gas, and the new is argon gas.

In the periodic table of the chemical elements is the zero group (class) principal group of elements, symbol Ar or A, atomic number 18. Chemical properties are very inactive, generally do not produce compounds, but with water, hydroquinone, such as the formation of cage compound. Argon is chemically very stable and does not combine with other elements. So far, the only argon compound hydrogen fluoroargonide (HARF) has been prepared under extreme conditions. This fluorine, hydrogen, and argon compound is stable at -265°C. In addition, argon can be used as a guest molecule to form inclusion complexes with water. In addition to the above ground state substances, ions and excited state complexes (such as Arh and Arf) containing argon have been found, and theoretical calculations suggest that argon should form compounds that are stable at room temperature, although no clue of their existence has been found.

Argon gas

In addition, the existence of ARF2 was reported in the media in 2003, but has not been confirmed.

Low heat transfer rate is one of the characteristics of argon, it can be used as a scuba diving suit expansion of gases, argon gas can also be in the water instead of nitrogen in the lungs (absorption of pure oxygen is bad to the body, so water to add other gas in the lungs), because the nitrogen at high pressure will dissolve into the bloodstream and cause nitrogen narcosis, argon gas can relieve the symptoms. Argon is so versatile that the discovery of element 18 was a great discovery.