Plantilya:Infobox americium

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Americium
95Am
Eu

Am

(Uqs)
plutoniumamericiumcurium
Appearance
silvery white
General properties
Name, simbolo, kaiphan americium, Am, 95
Pronunciation Plantilya:IPAc-en
Plantilya:Respell
Element category aktinido
Group, period, block 37, f
Standard atomic weight (243)
Electron configuration [Rn] 5f7 7s2
2, 8, 18, 32, 25, 8, 2
Electron shells of americium (2, 8, 18, 32, 25, 8, 2)
History
Discovery Glenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso (1944)
Physical properties
Phase magahi
Density (near r.t.) 12 g·cm−3
Melting point 1449 K, 1176 °C, 2149 °F
Boiling point 2880 K, 2607 °C, 4725 °F
Heat of fusion 14.39 kJ·mol−1
Molar heat capacity 62.7 J·mol−1·K−1
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1239 1356
Atomic properties
Oxidation states 7, 6, 5, 4, 3, 2
(amphoteric oxide)
Electronegativity 1.3 (Pauling scale)
Ionization energies 1st: 578 kJ·mol−1
Atomic radius 173 pm
Covalent radius 180±6 pm
Miscellanea
Crystal structure hexagonal
Americium has a hexagonal crystal structure
Magnetic ordering paramagnetic
Electrical resistivity 0.69[1] µΩ·m
Thermal conductivity 10 W·m−1·K−1
CAS registry number 7440-35-9
Most stable isotopes
Main article: Isotopes of americium
iso NA half-life DM DE (MeV) DP
241Am trace 432.2 y SF - -
α 5.486 237Np
242mAm trace 141 y IT 0.049 242Am
α 5.637 238Np
SF - -
243Am trace 7370 y SF - -
α 5.275 239Np
t  h  u
· r

Plantilya:Template reference list

  1. Muller, W.; Schenkel, R.; Schmidt, H. E.; Spirlet, J. C.; McElroy, D. L.; Hall, R. O. A.; Mortimer, M. J. (1978). "The electrical resistivity and specific heat of americium metal". Journal of Low Temperature Physics 30 (5–6): 561. doi:10.1007/BF00116197. Bibcode1978JLTP...30..561M.