Amerikium
95
Am
Ryhmä
Ei saatavilla
Jakso
7
Lohko
f
Protonia
Elektronit
Neutronia
95
95
148
Yleiset ominaisuudet
Järjestysluku
95
Atomipaino
[243]
Massaluku
243
Luokka
Aktinoidit
Väri
Hopea
Radioaktiivisuus
Kyllä
Named after America
Kiderakenne
Yksinkertainen kuusikulmainen
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.
Elektroneja elektronikuorilla
2, 8, 18, 32, 25, 8, 2
Orbitaalirakenne
[Rn] 5f7 7s2
Americium often enters landfills from discarded smoke detectors
Fyysiset ominaisuudet
Olomuoto
Kiinteä
Tiheys
13,69 g/cm3
Sulamispiste
1449,15 K | 1176 °C | 2148,8 °F
Kiehumispiste
2880,15 K | 2607 °C | 4724,6 °F
Sulamislämpö
Ei saatavilla
Höyrystymislämpö
Ei saatavilla
Ominaislämpökapasiteetti
-
Esiintyvyys maankuoressa
Ei saatavilla
Esiintyvyys maailmankaikkeudessa
Ei saatavilla
CAS-numero
7440-35-9
PubChem CID-numero
Ei saatavilla
Atomiominaisuudet
Atomisäde
173 pm
Kovalenttisäde
180 pm
Elektronegatiivisuus
1,3 (Paulingin asteikko)
Ionisoitumispotentiaali
5,9738 eV
Moolitilavuus
17,78 cm3/mol
Lämmönjohtavuus
0,1 W/cm·K
Hapetusluvut
2, 3, 4, 5, 6
Käyttö
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
Isotooppi
Vakaat isotoopit
-Epävakaat isotoopit
229Am, 231Am, 232Am, 233Am, 234Am, 235Am, 236Am, 237Am, 238Am, 239Am, 240Am, 241Am, 242Am, 243Am, 244Am, 245Am, 246Am, 247Am, 248Am, 249Am