Americium
95
Am
Gruppe
i/t
Periode
7
Blokk
f
Proton
Elektron
Nøytron
95
95
148
Generelle eigenskapar
Atomnummer
95
Atommasse
[243]
Massetal
243
Kategori
Aktinid
Farge
Sølv
Radioaktiv
Ja
Named after America
Krystallstruktur
Enkel heksagonal
Historie
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.
Elektron per energinivå
2, 8, 18, 32, 25, 8, 2
Elektronkonfigurasjon
[Rn] 5f7 7s2
Americium often enters landfills from discarded smoke detectors
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
13,69 g/cm3
Smeltepunkt
1449,15 K | 1176 °C | 2148,8 °F
Kokepunkt
2880,15 K | 2607 °C | 4724,6 °F
Smeltevarme
i/t kJ/mol
Fordampingsvarme
i/t kJ/mol
Spesifikk varmekapasitet
- J/g·K
Førekomst i jordskorpa
i/t
Førekomst i universet
i/t
CAS-nummer
7440-35-9
PubChem CID-nummer
i/t
Atom eigenskapar
Atomradius
173 pm
Kovalent radius
180 pm
Elektronegativitet
1,3 (Paulings skala)
Ioniseringspotensial
5,9738 eV
Molart volum
17,78 cm3/mol
Termisk konduktivitet
0,1 W/cm·K
Oksidasjonstrinn
2, 3, 4, 5, 6
Bruksområde
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
Isotopar
Stabile isotopar
-Ustabile isotopar
229Am, 231Am, 232Am, 233Am, 234Am, 235Am, 236Am, 237Am, 238Am, 239Am, 240Am, 241Am, 242Am, 243Am, 244Am, 245Am, 246Am, 247Am, 248Am, 249Am