Argon
18
Ar
Ryhmä
18
Jakso
3
Lohko
p
Protonia
Elektronit
Neutronia
18
18
22
Yleiset ominaisuudet
Järjestysluku
18
Atomipaino
39,948
Massaluku
40
Luokka
Jalokaasut
Väri
Väritön
Radioaktiivisuus
Ei
From the Greek argos, inactive
Kiderakenne
Pintakeskinen kuutiollinen
Historia
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.
Elektroneja elektronikuorilla
2, 8, 8
Orbitaalirakenne
[Ne] 3s2 3p6
Argon makes a distinctive blue-green gas laser
Fyysiset ominaisuudet
Olomuoto
Kaasu
Tiheys
0,0017837 g/cm3
Sulamispiste
83,8 K | -189,35 °C | -308,83 °F
Kiehumispiste
87,3 K | -185,85 °C | -302,53 °F
Sulamislämpö
1,18 kJ/mol
Höyrystymislämpö
6,5 kJ/mol
Ominaislämpökapasiteetti
0,52 J/g·K
Esiintyvyys maankuoressa
0,00015%
Esiintyvyys maailmankaikkeudessa
0,02%
CAS-numero
7440-37-1
PubChem CID-numero
23968
Atomiominaisuudet
Atomisäde
71 pm
Kovalenttisäde
106 pm
Elektronegatiivisuus
-
Ionisoitumispotentiaali
15,7596 eV
Moolitilavuus
22,4 cm3/mol
Lämmönjohtavuus
0,0001772 W/cm·K
Hapetusluvut
0
Käyttö
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
Isotooppi
Vakaat isotoopit
36Ar, 38Ar, 40ArEpävakaat isotoopit
30Ar, 31Ar, 32Ar, 33Ar, 34Ar, 35Ar, 37Ar, 39Ar, 41Ar, 42Ar, 43Ar, 44Ar, 45Ar, 46Ar, 47Ar, 48Ar, 49Ar, 50Ar, 51Ar, 52Ar, 53Ar