Argon
18
Ar
Gruppe
18
Periode
3
Blokk
p
Protons
Electrons
Neutrons
18
18
22
Generelle eigenskapar
Atomnummer
18
Atommasse
39,948
Mass Number
40
Kategori
Edelgassar
Farge
Fargelaus
Radioactive
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.
Elektron per energinivå
2, 8, 8
Elektronkonfigurasjon
[Ne] 3s2 3p6
Argon makes a distinctive blue-green gas laser
Fysiske eigenskapar
Tilstandsform
Gass
Tettleik
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
Fordampingsvarme
6,5 kJ/mol
Spesifikk varmekapasitet
0,52 J/g·K
Abundance in Earth's crust
0,00015%
Abundance in Universe
0,02%
CAS Number
7440-37-1
PubChem CID Number
23968
Atom eigenskapar
Atomradius
71 pm
Kovalent radius
106 pm
Elektronegativitet
-
Ioniseringspotensial
15,7596 eV
Molart volum
22,4 cm3/mol
Termisk konduktivitet
0,0001772 W/cm·K
Oksidasjonstrinn
0
Applications
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
Isotopes
Stable Isotopes
36Ar, 38Ar, 40ArUnstable Isotopes
30Ar, 31Ar, 32Ar, 33Ar, 34Ar, 35Ar, 37Ar, 39Ar, 41Ar, 42Ar, 43Ar, 44Ar, 45Ar, 46Ar, 47Ar, 48Ar, 49Ar, 50Ar, 51Ar, 52Ar, 53Ar