Americium
95
Am
Grupp
Ej tillämplig
Period
7
Block
f
Protoner
Elektroner
Neutroner
95
95
148
Generella Egenskaper
Atomnummer
95
Atommassa
[243]
Masstal
243
Kategori
Aktinider
Färg
Silver
Radioaktiv
Ja
Named after America
Kristallstruktur
Enkelt hexagonalt
Historia
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 skal
2, 8, 18, 32, 25, 8, 2
Elektronkonfiguration
[Rn] 5f7 7s2
Americium often enters landfills from discarded smoke detectors
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
13,69 g/cm3
Smältpunkt
1449,15 K | 1176 °C | 2148,8 °F
Kokpunkt
2880,15 K | 2607 °C | 4724,6 °F
Smältvärme
Ej tillämplig
Ångbildningsvärme
Ej tillämplig
Specifik värmekapacitet
-
Förekomst i jordskorpan
Ej tillämplig
Förekomst i universum
Ej tillämplig
CAS-nummer
7440-35-9
PubChem CID-nummer
Ej tillämplig
Atomära Egenskaper
Atomradie
173 pm
Kovalent radie
180 pm
Elektronegativitet
1,3 (Paulingskalan)
Jonisationspotential
5,9738 eV
Molvolym
17,78 cm3/mol
Värmeledningsförmåga
0,1 W/cm·K
Oxidationstillstånd
2, 3, 4, 5, 6
Användningsområden
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
Stabila isotoper
-Instabila isotoper
229Am, 231Am, 232Am, 233Am, 234Am, 235Am, 236Am, 237Am, 238Am, 239Am, 240Am, 241Am, 242Am, 243Am, 244Am, 245Am, 246Am, 247Am, 248Am, 249Am