Аргон
18
Ar
Група
18
Периода
3
Блок
p
Протони
Електрони
Неутрони
18
18
22
Општа својства
Атомски број
18
Атомска маса
39,948
Масени број
40
Категорија
Племенити гасови
Боја
Безбојни
Радиоактиван
Не
From the Greek argos, inactive
Кристална структура
Површинскицентрична Кубична
Историја
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.
Електрони по љусци
2, 8, 8
Електронска конфигурација
[Ne] 3s2 3p6
Argon makes a distinctive blue-green gas laser
Физичка својства
Стање
Гас
Густина
0,0017837 g/cm3
Температура топљења
83,8 K | -189,35 °C | -308,83 °F
Температура кључања
87,3 K | -185,85 °C | -302,53 °F
Топлота топљења
1,18 kJ/mol
Топлота испаравања
6,5 kJ/mol
Специфична топлота
0,52 J/g·K
Заступљеност у Земљиној кори
0,00015%
Заступљеност у Космосу
0,02%
CAS број
7440-37-1
ПубЦхем ЦИД број
23968
Атомска својства
Атомски радијус
71 pm
Ковалентни радијус
106 pm
Електронегативност
-
Јонизујући потенцијал
15,7596 eV
Молска запремина
22,4 cm3/mol
Топлотна проводљивост
0,0001772 W/cm·K
Оксидациона стања
0
Примена
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
Изотопи
Стабилни изотопи
36Ar, 38Ar, 40ArНестабилни изотопи
30Ar, 31Ar, 32Ar, 33Ar, 34Ar, 35Ar, 37Ar, 39Ar, 41Ar, 42Ar, 43Ar, 44Ar, 45Ar, 46Ar, 47Ar, 48Ar, 49Ar, 50Ar, 51Ar, 52Ar, 53Ar