67
Ho
無法計量
週期
6
f
個質子
電子
個中子
67
67
98
一般屬性
原子序數
67
標準原子質量
164.93032
品質編號
165
類別
鑭系元素
顏色
銀色
放射性
From the Latin word Holmia meaning Stockholm
晶體結構
簡單六角形
歷史
Holmium was discovered by Swiss chemists Marc Delafontaine and Jacques-Louis Soret in 1878.

They noticed the aberrant spectrographic absorption bands of the then-unknown element.

Later in 1878, Per Teodor Cleve independently discovered the element while he was working on erbia earth.
每個外殼的電子
2, 8, 18, 29, 8, 2
電子排布
[Xe] 4f11 6s2
Ho
Holmium has the highest magnetic strength of any naturally occurring element
物理性質
物態
固體
密度
8.795 g/cm3
熔點
1734.15 K | 1461 °C | 2661.8 °F
沸點
2993.15 K | 2720 °C | 4928 °F
熔化熱
17 kJ/mol
汽化熱
265 kJ/mol
比熱容
0.165 J/g·K
地殼豐度
0.00012%
宇宙豐度
5×10-8%
Ultrapure
圖片來源: Images-of-elements
Ultrapure holmium
CAS 編號
7440-60-0
Pubchem CID 編號
23988
原子性質
原子半徑
176 pm
共價半徑
192 pm
電負性
1.23 (鲍林标度)
電離電位
6.0215 eV
原子體積
18.7 cm3/mol
熱導率
0.162 W/cm·K
氧化態
3
應用
Holmium is used to create the strongest artificially generated magnetic fields, when placed within high-strength magnets as a magnetic pole piece.

It is one of the colorants used for cubic zirconia and glass, providing yellow or red coloring.

Holmium isotopes are good neutron absorbers and are used in nuclear reactor control rods.
Holmium is considered to be of low toxicity
同位素
穩定同位素
165Ho
不穩定同位素
140Ho, 141Ho, 142Ho, 143Ho, 144Ho, 145Ho, 146Ho, 147Ho, 148Ho, 149Ho, 150Ho, 151Ho, 152Ho, 153Ho, 154Ho, 155Ho, 156Ho, 157Ho, 158Ho, 159Ho, 160Ho, 161Ho, 162Ho, 163Ho, 164Ho, 166Ho, 167Ho, 168Ho, 169Ho, 170Ho, 171Ho, 172Ho, 173Ho, 174Ho, 175Ho