Symbol Am Atomic radius: pm 131 Fusion: kJ/Mole 14.39
Name Americium Ionic radius: pm (+3)98 Boiling point: C 2011
Atomic number 95 Electron affinity - Melting point: C 1176
Atomic weight 243.0 1st  ion potential 5.99 Specific Heat Cap: J/(g K) -
Classification Trans metal Natural form Solid Thermal Cond: W/(cm K) -
Configuration [Rn]5f77s2 Crystal structure Hex Electrical Cond 0.022
Oxidation states 3,4,5,6 Density 13.6 Abundance: mg/kg-crust Synthetic
Electronegativity - Vaporization: kJ/Mole -    
Although americium is undetected in nature, it was artificially produced in 1944 from plutonium-239 by Glenn T. Seaborg,Ralph A. James, Leon O. Morgan, and Albert Ghiorso in a nuclear reactor.  More info! Uses - smoke detectors, a portable source of gamma rays