Properties

CAS Number7440-59-7
PubChem CID23987
Atomic Radius31
Atomic Volume27.2
Atomic Weight4.003
Blocks
Boiling Point-268.93
Bulk Modulus
CategoryNoble gases
Crystal StructureFace Centered Cubic
Color
Covalent Radius28
Density0
Electrical Resistivity
Electron Configuration1s2
Electrons per shell2
Electronegativity-
Electrons2
Group18
Heat of Fusion0.02
Heat of Vaporization0.083
Ionization Potential24.587
Magnetic Ordering
Magnetic Susceptibility
Mass4.003
Mass Number2
Melting Point-272.2
NameHelium
Neutrons2
Atomic Number4
Oxidation States0
Period1
PhaseGas
Poisson Ratio
Protons2
Shear Modulus
Specific Heat Capacity5.193
SymbolHe
Thermal Conductivity0.002
Van der Waals radius
Young's Modulus
Abundance
Abundance in Earth's crust5.5×10-7%
Abundance in Universe23%
He Helium 2 4.002602 18 1 s 2 -272.2 -268.9 1s2 2 0.0001785 5.5E-7% Colorless Hexagonal 4.16 {"1":"2372.3","2":"5250.5"} 2377 0 32 0 31.8 0.021 0.0845 5.193 0.152 0 Gas, Diamagnetic, NobleGas, Nonmetal, Stable, Natural HEE-li-em Light, odorless, colorless, tasteless inert gas. Second most abundant element in the universe. Sixth most abundant in the earth's atmosphere. Used in balloons, deep sea diving & welding. Also used in very low temperature research. Found in natural gas deposits & in the air (5 parts per billion) Constantly lost to space; replenished by radioactive decay (alpha particles). a8FJEiI5e6Q Helium
Fermium was discovered as a component of the debris of the first hydrogen bomb explosion in 1952.

It was identified by Albert Ghiorso and co-workers at the University of California, Berkeley in collaboration with the Argonne and Los Alamos National Laboratories, in the fallout from the Ivy Mike nuclear test.

The new element was produced by the nuclear fission of 17 neutrons with uranium-238. Named after Nobel laureate Enrico Fermi, one of the pioneers of nuclear physics 2 1895 William Ramsay London, England From the Greek word "helios" meaning "sun"

Isotopes of Fermium

Standard Atomic Weight

4.002602(2)

Stable Isotopes

3He 4He

Unstable Isotopes

5He 6He 7He 8He 9He 10He

Fermium is harmful due to its radioactivity
Sixteen isotopes of fermium are known to exist
Fermium is used for scientific research purposes only.