36
Kr
18
週期
4
p
個質子
電子
個中子
36
36
48
一般屬性
原子序數
36
標準原子質量
83.798
品質編號
84
類別
惰性氣體
顏色
無色
放射性
From the Greek word kryptos, hidden
晶體結構
面居中立方
歷史
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.
每個外殼的電子
2, 8, 18, 8
電子排布
[Ar] 3d10 4s2 4p6
Kr
When ionized, krypton gas emits bright white light
物理性質
物態
氣體
密度
0.003733 g/cm3
熔點
115.79 K | -157.36 °C | -251.25 °F
沸點
119.93 K | -153.22 °C | -243.8 °F
熔化熱
1.64 kJ/mol
汽化熱
9.02 kJ/mol
比熱容
0.248 J/g·K
地殼豐度
1.5×10-8%
宇宙豐度
4×10-6%
Vial
圖片來源: Images-of-elements
Vial of glowing ultrapure krypton
CAS 編號
7439-90-9
Pubchem CID 編號
5416
原子性質
原子半徑
88 pm
共價半徑
116 pm
電負性
3.00 (鲍林标度)
電離電位
13.9996 eV
原子體積
38.9 cm3/mol
熱導率
0.0000949 W/cm·K
氧化態
2
應用
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
同位素
穩定同位素
78Kr, 80Kr, 82Kr, 83Kr, 84Kr, 86Kr
不穩定同位素
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