ChemiPlus Logo
Dictionary - Training


 General | States | Energies | Oxidation & Electrons | Appearance & Characteristics | Reactions | Other Forms Radius | Conductivity | Abundance


Name: Americium Symbol: Am
Group: Rare Earth, Actinides Atomic weight: (243)
Density @ 293 K: 13.6 g/cm3 Atomic volume: 17.86 cm3/mol
Group: Rare Earth, Actinides discovered: 1944


state (s, l, g): s
melting point: 1267.2 K boiling point: 2873 K
Heat of fusion: 14.40 kJ/mol Heat of vaporization: ?


1st ionization energy: 578 kJ/mole
electronegativity: 1.3 2nd ionization energy: kJ/mole
electron affinity: kJ/mole 3rd ionization energy: kJ/mole
Specific heat: 0.11 J/gK heat atomization: kJ/mole atoms

Oxidation & Electrons:

Shells: 2,8,18,32,25,8,2 electron configuration: [Rn] 5f7 7s2
minimum oxidation number: 0 maximum oxidation number: 6
min. common oxidation no.: 0 max. common oxidation no.: 3

Appearance & Characteristics:

structure: fcc: face-centered cubic color: silvery-white
uses: smoke detector toxicity:
hardness: mohs characteristics: Radioactive


reaction with air:
reaction with 6M HCl: reaction with 6M HCl:
reaction with 15M HNO3: reaction with 6M NaOH:

Other Forms:

number of isotopes: 0 hydride(s): AmH2 AmH3
oxide(s): AmO Am2O3 AmO2 chloride(s): AmCl2 AmCl3


ionic radius (2- ion): pm ionic radius (1- ion): pm
atomic radius: 173 pm ionic radius (1+ ion): pm
ionic radius (2+ ion): pm ionic radius (3+ ion): 111.5 pm


thermal conductivity: J/m-sec-deg
electrical conductivity: 1/mohm-cm polarizability: 23.3 A^3


source: Synthetic
rel. abund. solar system: log abundance earth's crust: log
cost, pure: $/100g cost, bulk: $/100g