ホルミウム
67
Ho
族
該当なし
周期
6
ブロック
f
陽子
電子
中性子
67
67
98
一般特性
原子番号
67
原子量
164.93032
質量数
165
カテゴリ
ランタノイド
色
銀色
放射性
いいえ
From the Latin word Holmia meaning Stockholm
結晶構造
六方最密構造
歴史
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.
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.
電子殻
2, 8, 18, 29, 8, 2
電子配置
[Xe] 4f11 6s2
Holmium has the highest magnetic strength of any naturally occurring element
物理特性
相
固体
密度
8.795 g/㎝3
融点
1734.15 K | 1461 °C | 2661.8 °F
沸点
2993.15 K | 2720 °C | 4928 °F
融解熱
17 kJ/mol
蒸発熱
265 kJ/mol
熱容量
0.165 J/g·K
地殻中における存在比
0.00012%
宇宙空間における存在比
5×10-8%
CAS登録番号
7440-60-0
PubChem CID番号
23988
原子特性
原子半径
176 pm
共有結合半径
192 pm
電気陰性度
1.23 (ポーリングの値)
イオン化エネルギー
6.0215 eV
モル体積
18.7 ㎝3/mol
熱伝導率
0.162 W/㎝·K
酸化数
3
用途
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.
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
同位体
安定同位体
165Ho不安定同位体
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