Template:Infobox americium

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[[Category:Template:Pagetype with short description]]

Americium, 95Am
Americium microscope.jpg
Americium
Pronunciation/ˌæmɪˈrɪsiəm/ (Template:Respell)
Appearancesilvery white
Mass number[243]
Americium in the periodic table
Template:Periodic table (32 columns, micro) Eu

Am

(Uqe)
plutoniumamericiumcurium
Atomic number (Z)95
Groupgroup 3
Periodperiod 7
Block  f-block
Electron configuration[Rn] 5f7 7s2
Electrons per shell2, 8, 18, 32, 25, 8, 2
Physical properties
Phase at STPsolid
Melting point1449 K ​(1176 °C, ​2149 °F)
Boiling point2880 K ​(2607 °C, ​4725 °F) (calculated)
Density (near r.t.)12 g/cm3
Heat of fusion14.39 kJ/mol
Molar heat capacity28[1] J/(mol·K)
Vapor pressure
P (Pa) 1 10 100 1 k 10 k 100 k
at T (K) 1239 1356
Atomic properties
Oxidation states+2, +3, +4, +5, +6, +7 (an amphoteric oxide)
ElectronegativityPauling scale: 1.3
Ionization energies
  • 1st: 578 kJ/mol
Atomic radiusempirical: 173 pm
Covalent radius180±6 pm
Color lines in a spectral range
Spectral lines of americium
Other properties
Natural occurrencesynthetic
Crystal structuredouble hexagonal close-packed (dhcp)
Double hexagonal close packed crystal structure for americium
Thermal conductivity10 W/(m·K)
Electrical resistivity0.69 µΩ·m[1]
Magnetic orderingparamagnetic
Magnetic susceptibility+1000.0·10−6 cm3/mol[2]
CAS Number7440-35-9
History
Namingafter the Americas
DiscoveryGlenn T. Seaborg, Ralph A. James, Leon O. Morgan, Albert Ghiorso (1944)
Main isotopes of americium
[[Isotope|IsoTemplate:Shytope]] [[Natural abundance|AbunTemplate:Shydance]] Half-life (t1/2) Decay mode [[Decay product|ProTemplate:Shyduct]]
241Am syn 432.2 y SF
α 237Np
242m1Am syn 141 y IT 242Am
α 238Np
SF
243Am syn 7370 y SF
α 239Np
Category Category: Americium
| references

[[Category:Infobox templates|Template:Remove first word]]

data m.p. cat
in calc from C diff report ref
C 1176
K 1449 1449 0
F 2149 2149 0 Template:Subpage other
max precision 0
WD Template:Wikidata Script error: No such module "EditAtWikidata". Template:Wikidata
input C: 1176, K: 1449, F: 2149
comment
data b.p. cat
in calc from C diff report ref
C 2607
K 2880 2880 0
F 4725 4725 0 Template:Subpage other
max precision 0
WD Template:Wikidata Script error: No such module "EditAtWikidata". Template:Wikidata
input C: 2607, K: 2880, F: 4725
comment (calculated)
Pu ←

i'box Pu

iso
95
Am (E)
→ Cm

i'box Cm

  Data sets read by {{Infobox element}}
Name and identifiers
Top image (caption, alt)
Pronunciation
Category (enwiki)
Standard atomic weight
  most stable isotope
Natural occurrence
Phase at STP
Oxidation states
Spectral lines image
Electron configuration (cmt, ref)
Term symbol * (cmt, ref)
Wikidata *
* Not used in {{Infobox element}} (2019-02-03)
See also {{Infobox element/symbol-to--navbox}}

References

  1. 1.0 1.1 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. Bibcode:1978JLTP...30..561M. doi:10.1007/BF00116197.
  2. Weast, Robert (1984). CRC, Handbook of Chemistry and Physics. Boca Raton, Florida: Chemical Rubber Company Publishing. pp. E110. ISBN 0-8493-0464-4.

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