• fèi

  • 100

    Fm

  • Actinoids

    Fermium

  • Group

  • Period

    7

  • Block

    f

Chemical element【镄】
  • Protons

    100

  • Electrons

    100

  • Neutrons

    157

纪念费米

General Properties

Atomic Number
100
Atomic Weight
[257]
Mass Number
257
Category
Actinoids
Color
n/a
Radioactive
Yes
Discovery year
1952
Crystal Structure
n/a

History

镄在1952年第一颗氢弹爆炸的碎片终被观察到

它被吉奥索及其同事在加州大学伯克利分校的碰撞试验室和阿贡和国家实验室鉴定出来

在常春藤麦克核测试中,这种新元素被用17个中子核一个铀238的核痕量制造出来
Electrons per shell
2, 8, 18, 32, 30, 8, 2
Electron Configuration
[Rn] 5f12 7s2
Fm

Physical Properties

Phase
Solid
Density
-
Melting Point
1800.15 K | 1527 °C | 2780.6 °F
Boiling Point
-
Heat of Fusion
Heat of Vaporization
Specific Heat Capacity
-

Atomic Properties

Atomic Radius
-
Covalent Radius
-
Electronegativity
1.3 (鲍林标度)
Ionization Potential
6.5 eV
Atomic Volume
29.1 cm3/mol
Thermal Conductivity
0.1 W/cm·K
Oxidation States
2, 3
Abundance in Earth's crust
Abundance in Universe
CAS Number
7440-72-4
PubChem CID Number

Applications

镄仅仅用在于科研目的
镄有16种同位素
Stable Isotopes
-
Unstable Isotopes

241Fm, 242Fm, 243Fm, 244Fm, 245Fm, 246Fm, 247Fm, 248Fm, 249Fm, 250Fm, 251Fm, 252Fm, 253Fm, 254Fm, 255Fm, 256Fm, 257Fm, 258Fm, 259Fm, 260Fm