Argon

Kemiallinen merkki: Ar
Järjestysluku: 18
Kategoria: jalokaasut
Ryhmä: 18
Jakso: 3
Lohko: p
Moolimassa: 39,948 g/mol
Elektronia kuorilla: 2, 8, 8
CAS-numero: 7440-37-1
Olomuoto: kaasu
Tiheys: 1,784 g/l (0 °C, 101,325 kPa)
Sulamispiste: 83,80 K (-189,35 °C, -308,83 °F)
Kiehumispiste: 87,30 K (-185,85 °C, -302,53 °F)
Kiderakenne: cubic face centered
Hapetusluvut: 0
Elektronegatiivisuus: inert
Nimen alkuperä: argon
Nimen tarkoitus: a Greek word which means 'inactive' due to the element's inactivity
Faktoja:
- is present in the Earth's atmosphere at 0,93% by volume
- is the most abundant and most frequently used of the jalokaasut
- is colorless, odorless, tasteless and nontoxic in both its liquid and gaseous forms
- up until 1957 its symbol was o
- argon was thought to be inert and unable to form any compounds, but in August 2000 the first argon compound was formed by the researchers in Finland - by shining ultraviolet light onto frozen argon containing a small amount of hydrogen fl
- is used e,g as a fire extinguisher gas, metal inert gas welding, as a preservative and in laboratory gloveboxes
- cryosurgery procedures such as cryoablation use liquefied argon to destroy cancer cells
- although argon is non-toxic, it does not satisfy the body's need for oxygen and is thus an asphyxiant