Americium

95
Am
Gruppe
n/a
Periode
7
Blok
f
Protons
Electrons
Neutrons
95
95
148
General Properties
Atomnummer
95
Atommasse
[243]
Mass Number
243
Kategori
Actinider
Farve
Silver
Radioactive
Ja
Named after America
Krystalstruktur
Simpel Hexagonal
History
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.
Elektroner i hver skal
2, 8, 18, 32, 25, 8, 2
Elektronkonfiguration
[Rn] 5f7 7s2
Am
Americium often enters landfills from discarded smoke detectors
Physical Properties
Tilstandsform
Fast stof
Massefylde
13,69 g/cm3
Smeltepunkt
1449,15 K | 1176 °C | 2148,8 °F
Kogepunkt
2880,15 K | 2607 °C | 4724,6 °F
Smeltevarme
n/a
Fordampningsvarme
n/a
Varmefylde
-
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
A
Billede akkrediteringer: Wikimedia Commons (Bionerd)
A small disc of Am-241 under the microscope
CAS Number
7440-35-9
PubChem CID Number
n/a
Atomic Properties
Atomradius
173 pm
Kovalent radius
180 pm
Elektronegativitet
1,3 (Paulings skala)
Ionization Potential
5,9738 eV
Atomic Volume
17,78 cm3/mol
Varmeledningsevne
0,1 W/cm·K
Oxidationstrin
2, 3, 4, 5, 6
Applications
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 is harmful due to its radioactivity
Isotoper
Stable Isotopes
-
Unstable Isotopes
229Am, 231Am, 232Am, 233Am, 234Am, 235Am, 236Am, 237Am, 238Am, 239Am, 240Am, 241Am, 242Am, 243Am, 244Am, 245Am, 246Am, 247Am, 248Am, 249Am