Криптон

36
Kr
Група
18
Периода
4
блок
p
Protons
Electrons
Neutrons
36
36
48
Општи Својства
Атомски број
36
Атомска тежина
83,798
Mass Number
84
Category
Благородни гасови
Color
Colorless
Radioactive
Не
From the Greek word kryptos, hidden
Кристална структура
Face Centered Cubic
History
Scottish chemist Sir William Ramsay and his assistant English chemist Morris Travers discovered krypton in 1898 in London.

They found krypton in the residue left from evaporating nearly all components of liquid air.

William Ramsay was awarded the 1904 Nobel Prize in Chemistry for discovery of a series of noble gases, including krypton.
Electrons per shell
2, 8, 18, 8
Електронска конфигурација
[Ar] 3d10 4s2 4p6
Kr
When ionized, krypton gas emits bright white light
Физички Својства
Фаза
Gas
Густина
0,003733 g/cm3
Точка на топење
115,79 K | -157,36 °C | -251,25 °F
Точка на вриење
119,93 K | -153,22 °C | -243,8 °F
Топлина на топење
1,64 kJ/mol
Топлина на испарување
9,02 kJ/mol
Specific Heat Capacity
0,248 J/g·K
Abundance in Earth's crust
1,5×10-8%
Abundance in Universe
4×10-6%
Vial
Кредити на слика: Images-of-elements
Vial of glowing ultrapure krypton
CAS Number
7439-90-9
PubChem CID Number
5416
Атомски Својства
Атомски полупречник
88 pm
Ковалентен полупречник
116 pm
Електронегативност
3,00 (Полингова скала)
Ionization Potential
13,9996 eV
Atomic Volume
38,9 cm3/mol
Thermal Conductivity
0,0000949 W/cm·K
Oxidation States
2
Applications
Krypton is used in certain photographic flash lamps for high-speed photography.

Krypton-83 has application in magnetic resonance imaging (MRI) for imaging airways.

Krypton is used as a filling gas for energy-saving fluorescent lights and as an inert filling gas in incandescent bulbs.
Krypton is considered to be non-toxic
Isotopes
Stable Isotopes
78Kr, 80Kr, 82Kr, 83Kr, 84Kr, 86Kr
Unstable Isotopes
69Kr, 70Kr, 71Kr, 72Kr, 73Kr, 74Kr, 75Kr, 76Kr, 77Kr, 79Kr, 81Kr, 85Kr, 87Kr, 88Kr, 89Kr, 90Kr, 91Kr, 92Kr, 93Kr, 94Kr, 95Kr, 96Kr, 97Kr, 98Kr, 99Kr, 100Kr, 101Kr