Аргон
18
Ar
Група
18
Период
3
Блок
p
Протони
Електрони
Неутрони
18
18
22
Главни свойства
Атомен номер
18
Атомна маса
39.948
Масов номер
40
Категория
Благородни газове
Цвят
Безцветен
Радиоактивни
Не
From the Greek argos, inactive
Кристална структура
Кубична стенноцентрирана решетка
История
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.
Електрон на обвивка
2, 8, 8
Електронна конфигурация
[Ne] 3s2 3p6
Argon makes a distinctive blue-green gas laser
Физични свойства
Фаза
Газ
Плътност
0.0017837 g/cm3
Температура на топене
83.8 K | -189.35 °C | -308.83 °F
Температура на кипене
87.3 K | -185.85 °C | -302.53 °F
Топлина на сливането
1.18 kJ/mol
Топлина на изпаряване
6.5 kJ/mol
Специфичен топлинен капацитет
0.52 J/g·K
Изобилие в земната кора
0.00015%
Изобилие в вселената
0.02%
Номер на CAS
7440-37-1
Номер на PubChem CID
23968
Атомни свойства
Атомен радиус
71 pm
Ковалентен радиус
106 pm
Електроотрицателност
-
Йонизационен потенциал
15.7596 eV
Моларен обем
22.4 cm3/mol
Топлопроводимост
0.0001772 W/cm·K
Оксидационни държави
0
Приложения
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