Аргон

18
Ar
Група
18
Периода
3
блок
p
Protons
Electrons
Neutrons
18
18
22
Општи Својства
Атомски број
18
Атомска тежина
39,948
Mass Number
40
Category
Благородни гасови
Color
Colorless
Radioactive
Не
From the Greek argos, inactive
Кристална структура
Face Centered Cubic
History
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.
Electrons per shell
2, 8, 8
Електронска конфигурација
[Ne] 3s2 3p6
Ar
Argon makes a distinctive blue-green gas laser
Физички Својства
Фаза
Gas
Густина
0,0017837 g/cm3
Точка на топење
83,8 K | -189,35 °C | -308,83 °F
Точка на вриење
87,3 K | -185,85 °C | -302,53 °F
Топлина на топење
1,18 kJ/mol
Топлина на испарување
6,5 kJ/mol
Specific Heat Capacity
0,52 J/g·K
Abundance in Earth's crust
0,00015%
Abundance in Universe
0,02%
Vial
Кредити на слика: Images-of-elements
Vial of glowing ultrapure argon
CAS Number
7440-37-1
PubChem CID Number
23968
Атомски Својства
Атомски полупречник
71 pm
Ковалентен полупречник
106 pm
Електронегативност
-
Ionization Potential
15,7596 eV
Atomic Volume
22,4 cm3/mol
Thermal Conductivity
0,0001772 W/cm·K
Oxidation States
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 considered to be non-toxic
Isotopes
Stable Isotopes
36Ar, 38Ar, 40Ar
Unstable Isotopes
30Ar, 31Ar, 32Ar, 33Ar, 34Ar, 35Ar, 37Ar, 39Ar, 41Ar, 42Ar, 43Ar, 44Ar, 45Ar, 46Ar, 47Ar, 48Ar, 49Ar, 50Ar, 51Ar, 52Ar, 53Ar