Properties

CAS Number54084-70-7
PubChem CIDna
Atomic Radius-
Atomic Volume-
Atomic Weight[286]
Blockp
Boiling Point1,100
Bulk Modulus
CategoryPost-transition metals
Crystal Structure
Color
Covalent Radius136
Density16
Electrical Resistivity
Electron Configuration[Rn] 5f14 6d10 7s2 7p1
Electrons per shell2, 8, 18, 32, 32, 18, 3
Electronegativity-
Electrons113
Group13
Heat of Fusionna
Heat of Vaporizationna
Ionization Potential-
Magnetic Ordering
Magnetic Susceptibility
Mass[286]
Mass Number113
Melting Point430
NameNihonium
Neutrons173
Atomic Number286
Oxidation States1, 3, 5
Period7
PhaseSolid
Poisson Ratio
Protons113
Shear Modulus
Specific Heat Capacity-
SymbolNh
Thermal Conductivity-
Van der Waals radius
Young's Modulus
Abundance
Abundance in Earth's crustna
Abundance in Universena
Nh Nihonium 113 (284) 13 7 p 113 [Rn] 5f14 6d10 7s2 7p1 2 8 18 32 32 18 3 None 1 20 m 28.3m AlphaEmission Metal, Radioactive, Synthetic, PoorMetal Ac7iFepG2CY Nihonium
Americium-241 was first identified in 1944 by Glenn T. Seaborg, Ralph A. James, Leon O. Morgan and Albert Ghiorso at the metallurgical laboratory at the University of Chicago.

It was produced by irradiating plutonium with neutrons during the Manhattan Project.

Americium was first isolated as a pure compound by Burris Cunningham in 1945, at the University of Chicago. Named after America 113 Temporary systematic IUPAC nomenclature

Isotopes of Americium

Standard Atomic Weight

Stable Isotopes

Unstable Isotopes

283Uut 284Uut 285Uut 286Uut 287Uut

Americium is harmful due to its radioactivity
Americium often enters landfills from discarded smoke detectors
Americium is used in commercial ionization chamber smoke detectors, as well as in neutron sources and industrial gauges.

Americium-241 has been used as a portable source of both gamma rays and alpha particles for a number of medical and industrial uses.

It is also used as a target material in nuclear research to make even heavier elements.