Americij
95
Am
Skupina
n/a
Perioda
7
Blok
f
Protoni
Elektroni
Neutroni
95
95
148
Opća svojstva
Atomski broj
95
Relativna atomska masa
[243]
Maseni broj
243
Kategorija
Aktinoidi
Boja
Srebrna
Radioaktivan
Da
Imenovan po Americi
Kristalna struktura
Jednostavna heksagonska
Povijest
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.
Elektrona po ljusci
2, 8, 18, 32, 25, 8, 2
Elektronska konfiguracija
[Rn] 5f7 7s2
Americium often enters landfills from discarded smoke detectors
Fizikalna svojstva
Agregacijsko stanje
Čvrsto
Gustoća
13,69 g/cm3
Talište
1449,15 K | 1176 °C | 2148,8 °F
Vrelište
2880,15 K | 2607 °C | 4724,6 °F
Toplina taljenja
n/a
Toplina isparavanja
n/a
Specifični toplinski kapacitet
-
Zastupljenost u Zemljinoj kori
n/a
Zastupljenost u svemiru
n/a
CAS broj
7440-35-9
PubChem CID broj
n/a
Atomska svojstva
Atomski radijus
173 pm
Kovalentni radijus
180 pm
Elektronegativnost
1,3 (Paulingova ljestvica)
Potencijal ionizacije
5,9738 eV
Atomski volumen
17,78 cm3/mol
Toplinska vodljivost
0,1 W/cm·K
Stanja oksidacije
2, 3, 4, 5, 6
Primjene
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
Izotopi
Stabilni izotopi
-Nestabilni izotopi
229Am, 231Am, 232Am, 233Am, 234Am, 235Am, 236Am, 237Am, 238Am, 239Am, 240Am, 241Am, 242Am, 243Am, 244Am, 245Am, 246Am, 247Am, 248Am, 249Am