Americium
95
Am
Gruppe
I/T
Periode
7
Blokk
f
Protoner
Elektroner
Nøytroner
95
95
148
Generelle egenskaper
Atomnummer
95
Atomvekt
[243]
Massetall
243
Kategori
Aktinoider
Farge
Sølv
Radioaktiv
Ja
Named after America
Krystallstruktur
Simple Hexagonal
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.
Elektroner per energinivå
2, 8, 18, 32, 25, 8, 2
Elektronkonfigurasjon
[Rn] 5f7 7s2
Americium often enters landfills from discarded smoke detectors
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
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
Fordampningsvarme
I/T
Spesifikk varmekapasitet
-
Forekomst i jordskorpa
I/T
Forekomst i universet
I/T
CAS Number
7440-35-9
PubChem CID Number
I/T
Atomegenskaper
Atomradius
173 pm
Kovalent radius
180 pm
Elektronegativitet
1,3 (Pauling-skalaen)
Ioniseringsenergi
5,9738 eV
Molart volum
17,78 cm3/mol
Termisk ledningsevne
0,1 W/cm·K
Oksidasjonstilstander
2, 3, 4, 5, 6
Bruksområder
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
Isotoper
Stabile isotoper
-Ustabile isotoper
229Am, 231Am, 232Am, 233Am, 234Am, 235Am, 236Am, 237Am, 238Am, 239Am, 240Am, 241Am, 242Am, 243Am, 244Am, 245Am, 246Am, 247Am, 248Am, 249Am