Americi
95
Am
Grup
n/a
Període
7
Bloc
f
Protons
Electrons
Neutrons
95
95
148
Propietats Generals
Nombre atòmic
95
Massa atòmica
[243]
Nombre de massa
243
Categoria
Actínids
Color
Plata
Radioactiu
Sí
Named after America
Estructura cristal·lina
Hexàgon simple
Història
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.
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.
Electrons per capa
2, 8, 18, 32, 25, 8, 2
Configuració electrònica
[Rn] 5f7 7s2
Americium often enters landfills from discarded smoke detectors
Propietats Físiques
Fase
Sòlid
Densitat
13,69 g/cm3
Punt de fusió
1449,15 K | 1176 °C | 2148,8 °F
Punt d'ebullició
2880,15 K | 2607 °C | 4724,6 °F
Entalpia de fusió
n/a
Entalpia de vaporització
n/a
Capacitat tèrmica específica
-
Abundància a l'escorça terrestre
n/a
Abundància a l'univers
n/a
Número CAS
7440-35-9
Número CID de PubChem
n/a
Propietats Atòmiques
Radi atòmic
173 pm
Radi covalent
180 pm
Electronegativitat
1,3 (Escala de Pauling)
Potencial d'ionització
5,9738 eV
Volum atòmic
17,78 cm3/mol
Conductivitat tèrmica
0,1 W/cm·K
Estats d'oxidació
2, 3, 4, 5, 6
Aplicacions
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.
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.
Americium is harmful due to its radioactivity
Isòtops
Isòtops estables
-Isòtops inestables
229Am, 231Am, 232Am, 233Am, 234Am, 235Am, 236Am, 237Am, 238Am, 239Am, 240Am, 241Am, 242Am, 243Am, 244Am, 245Am, 246Am, 247Am, 248Am, 249Am