Argon
18
Ar
Gruppe
18
Periode
3
Blokk
p
Protoner
Elektroner
Nøytroner
18
18
22
Generelle egenskaper
Atomnummer
18
Atomvekt
39,948
Massetall
40
Kategori
Edelgasser
Farge
Fargeløs
Radioaktiv
Nei
From the Greek argos, inactive
Krystallstruktur
Face Centered Cubic
Historie
Argon was suspected to be present in air by Henry Cavendish in 1785.
It was not isolated until 1894 by Lord Rayleigh and Sir William Ramsay in Scotland.
Argon became the first member of the noble gases to be discovered.
In 1957, IUPAC agreed that the symbol should change from A to Ar.
It was not isolated until 1894 by Lord Rayleigh and Sir William Ramsay in Scotland.
Argon became the first member of the noble gases to be discovered.
In 1957, IUPAC agreed that the symbol should change from A to Ar.
Elektroner per energinivå
2, 8, 8
Elektronkonfigurasjon
[Ne] 3s2 3p6
Argon makes a distinctive blue-green gas laser
Fysikalske egenskaper
Fase
Gass
Tetthet
0,0017837 g/cm3
Smeltepunkt
83,8 K | -189,35 °C | -308,83 °F
Kokepunkt
87,3 K | -185,85 °C | -302,53 °F
Smeltevarme
1,18 kJ/mol
Fordampningsvarme
6,5 kJ/mol
Spesifikk varmekapasitet
0,52 J/g·K
Forekomst i jordskorpa
0,00015%
Forekomst i universet
0,02%
CAS Number
7440-37-1
PubChem CID Number
23968
Atomegenskaper
Atomradius
71 pm
Kovalent radius
106 pm
Elektronegativitet
-
Ioniseringsenergi
15,7596 eV
Molart volum
22,4 cm3/mol
Termisk ledningsevne
0,0001772 W/cm·K
Oksidasjonstilstander
0
Bruksområder
Argon gas is used to fill conventional incandescent and fluorescent light bulbs.
Argon is also used as an inert gas shield for arc welding and cutting, as blanket for the production of titanium and other reactive elements.
It is used as a protective atmosphere for growing silicon and germanium crystals.
Argon is also used as an inert gas shield for arc welding and cutting, as blanket for the production of titanium and other reactive elements.
It is used as a protective atmosphere for growing silicon and germanium crystals.
Argon is considered to be non-toxic
Isotoper
Stabile isotoper
36Ar, 38Ar, 40ArUstabile isotoper
30Ar, 31Ar, 32Ar, 33Ar, 34Ar, 35Ar, 37Ar, 39Ar, 41Ar, 42Ar, 43Ar, 44Ar, 45Ar, 46Ar, 47Ar, 48Ar, 49Ar, 50Ar, 51Ar, 52Ar, 53Ar