特性

CAS Number7440-53-1
PubChem CID23981
原子半径180
モル体積20.8
原子量151.964
ブロックf
沸点1,529
Bulk Modulus
カテゴリランタノイド
結晶構造体心立方格子
銀色
共有結合半径198
密度5.243
Electrical Resistivity
電子配置[Xe] 4f7 6s2
電子殻2, 8, 18, 25, 8, 2
電気陰性度1.2
Electrons63
na
融解熱9.2
蒸発熱175
イオン化エネルギー5.67
Magnetic Ordering
Magnetic Susceptibility
質量151.964
Mass Number63
融点826
名称ユウロピウム
中性子89
原子番号152
酸化数2, 3
周期6
固体
Poisson Ratio
陽子63
Shear Modulus
熱容量0.182
記号Eu
熱伝導率0.139
Van der Waals radius
Young's Modulus
天然存在比
地殻中における存在比0.00018%
宇宙空間における存在比5×10-8%
Eu ユウロピウム 63 151.964 6 f 63 822.0 1529.0 [Xe] 4f7 6s2 2 8 18 25 8 2 5.24 0.00018% Silver Cubic: Body centered {"1":"547.1","2":"1085","3":"2404","4":"4120"} 547 50 +3,2 1.99 28.9 9.21 175.73 0.182 13.9 90.5K 0 Solid, Paramagnetic, Conductor, Lanthanide, Stable, Natural yoo-RO-pi-em Soft, silvery-white metal. Used with yttrium oxide to make red phosphors for color televisions. Obtained from monazite sand, which is a mixture of phosphates of calcium, thorium, cerium, and most other rare earths. 88YOmg_FUVo Europium
Boron compounds have been known for thousands of years, but the element was not discovered until 1808 by Sir Humphry Davy and by Gay-Lussac and Thenard.

Boron was not recognized as an element until it was isolated in 1808 by Sir Humphry Davy and by Joseph Louis Gay-Lussac and Louis Jacques Thénard.

Jöns Jakob Berzelius identified boron as an element in 1824. 英名の由来は、アラビア語の Buraq 若しくは、ペルシャ語の Burah からきた言葉です。和名の由来は、中国 で10世紀の「日華本草」にペルシャ語の音写としてホウ砂のことを中国語で「蓬砂」とした記述をし、14世紀には日本に伝来して「硼砂」と記されているため、硼(ホウ)素 になった。 63 1901 Eugene Demarcay France Named after "Europe"

ホウ素の同位体

Standard Atomic Weight

151.964(1)

安定同位体

151Eu 153Eu

不安定同位体

130Eu 131Eu 132Eu 133Eu 134Eu 135Eu 136Eu 137Eu 138Eu 139Eu 140Eu 141Eu 142Eu 143Eu 144Eu 145Eu 146Eu 147Eu 148Eu 149Eu 150Eu 152Eu 154Eu 155Eu 156Eu 157Eu 158Eu 159Eu 160Eu 161Eu 162Eu 163Eu 164Eu 165Eu 166Eu 167Eu

Elemental boron, boron oxide, boric acid, borates and many organoboron compounds are non-toxic
Boron is an essential nutrient for all green plants
Boron oxide is used in glassmaking and ceramics.

Borax is used in making fiberglass, as a cleansing fluid, a water softener, insecticide, herbicide and disinfectant.

Boric acid is used as a mild antiseptic and as a flame retardant.

Boron shielding is used as a control for nuclear reactors.