Argon
18
Ar
Groep
18
Periode
3
Blok
p
Protonen
Elektronen
Neutronen
18
18
22
Algemene Eigenschappen
Atoomnummer
18
Atomair gewicht
39,948
Massa Getal
40
Categorie
Edelgassen
Kleur
Kleurloos
Radioactief
Nee
Van het Griekse woord argos, inactief
Kristalstructuur
Zijvlak-gecentreerde Kubus
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.
Eletronen per schil
2, 8, 8
Electronconfiguratie
[Ne] 3s2 3p6
Argon makes a distinctive blue-green gas laser
Fysieke Eigenschappen
Fase
Gas
Dichtheid
0,0017837 g/cm3
Smeltpunt
83,8 K | -189,35 °C | -308,83 °F
Kookpunt
87,3 K | -185,85 °C | -302,53 °F
Fusiewarmte
1,18 kJ/mol
Verdampingswarmte
6,5 kJ/mol
Specifieke Warmtecapaciteit
0,52 J/g·K
Overvloedig aanwezig in de aardkorst
0,00015%
Overvloedig aanwezig in het universum
0,02%
CAS-nummer
7440-37-1
PubChem CID nummer
23968
Atoomeigenschappen
Atoomstraal
71 pm
Covalentiestraal
106 pm
Electronegativiteit
-
Ionisatiepotentiaal
15,7596 eV
Atoomvolume
22,4 cm3/mol
Thermische geleiding
0,0001772 W/cm·K
Oxidatietoestanden
0
Toepassingen
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
Isotopen
Stabiele isotopen
36Ar, 38Ar, 40ArInstabiele isotopen
30Ar, 31Ar, 32Ar, 33Ar, 34Ar, 35Ar, 37Ar, 39Ar, 41Ar, 42Ar, 43Ar, 44Ar, 45Ar, 46Ar, 47Ar, 48Ar, 49Ar, 50Ar, 51Ar, 52Ar, 53Ar