Americij
95
Am
Skupina
n/p
Perioda
7
Blok
f
Protoni
Elektroni
Nevtroni
95
95
148
Splošne lastnosti
Vrstno število
95
Atomska teža
[243]
Masno število
243
Kategorija
Aktinoidi
Barva
Srebrna
Radioaktivno
Da
Named after America
Kristalna struktura
Heksagonalna
Zgodovina
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.
Elektroni po lupinah
2, 8, 18, 32, 25, 8, 2
Razporeditev elektronov
[Rn] 5f7 7s2
Americium often enters landfills from discarded smoke detectors
Fizikalne lastnosti
Faza snovi
Trdnina
Gostota
13,69 g/cm3
Tališče
1449,15 K | 1176 °C | 2148,8 °F
Vrelišče
2880,15 K | 2607 °C | 4724,6 °F
Talilna toplota
n/p kJ/mol
Izparilna toplota
n/p kJ/mol
Toplotna kapaciteta
- J/g·K
Zastopanost v Zemljini skorji
n/p
Zastopanost v vesolju
n/p
CAS številka
7440-35-9
PubChem CID številka
n/p
Atomske lastnosti
Atomski polmer
173 pm
Kovalentni polmer
180 pm
Elektronegativnost
1,3 (Paulingova lestvica)
Ionizacijski potencial
5,9738 eV
Atomski volumen
17,78 cm3/mol
Toplotna prevodnost
0,1 W/cm·K
Oksidacijska stanja
2, 3, 4, 5, 6
Uporabe
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