100 Fm Fermium 257.0 u

Fermium

周期
7
族
—
区块
f-区块
相态 (STP)
Solid

Fermium is a synthetic element named after Enrico Fermi. It was also first identified in hydrogen bomb fallout debris.

About Fermium

Like einsteinium beside it, fermium was first identified in debris from a hydrogen bomb test, the element having been assembled inside the explosion by rapid successive neutron capture. It honours Enrico Fermi and holds atomic number 100 with a relative atomic mass of 257.0. The configuration [Rn] 5f12 7s2 places it late in the actinide series of period 7, and its Pauling electronegativity is given as 1.3. Under standard conditions it is a solid. Fermium marks a practical boundary in actinide production: it is the heaviest element that can be made in weighable amounts by neutron irradiation in a reactor, and everything past it requires bombardment with charged particles in an accelerator instead.

物理属性

原子质量 257.0 u
STP相态 Solid

电子属性

电负性 1.3

电子构型

构型 [Rn] 5f¹² 7s²

Electron Shell Configuration

Fermium electron shell configuration Fm 2e⁻ 8e⁻ 18e⁻ 32e⁻ 30e⁻ 8e⁻ 2e⁻
Electron shell structure of Fermium — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 32
5 (O) 30
6 (P) 8
7 (Q) 2

Position in Periodic Table

Fermium position in the periodic table Fm

区块与周期

区块

s p d f

周期

1 2 3 4 5 6 7

元素周期表

镧系元素 锕系元素

更多锕系元素

89 Ac Actinium 90 Th Thorium 91 Pa Protactinium 92 U Uranium 93 Np Neptunium 94 Pu Plutonium 95 Am Americium 96 Cm Curium 97 Bk Berkelium 98 Cf Californium

Frequently Asked Questions

What is Fermium?
Fermium (Fm) is a chemical element with atomic number 100. It is a solid at standard temperature and pressure, classified as a 锕系元素.
What are the key properties of Fermium?
Fermium has an atomic mass of 257.0 u.
What is the electron configuration of Fermium?
The electron configuration of Fermium is [Rn] 5f12 7s2. It is in the f-block of the periodic table.
What is the electronegativity of Fermium?
Fermium has an electronegativity of 1.3 on the Pauling scale.