Americiu

95
Am
Grupă
n/a
Perioadă
7
Bloc
f
Protoni
Electroni
Neutroni
95
95
148
Proprietăți Generale
Număr atomic
95
Masă atomică
[243]
Numar de masa
243
Categorie
Actinide
Culoare
Argint
Radioactive
Da
Numit după America
Structură cristalină
Sistemul Hexagonal
Istoric
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.
Electroni pe nivelul de energie
2, 8, 18, 32, 25, 8, 2
Configurație electronică
[Rn] 5f7 7s2
Am
Americium often enters landfills from discarded smoke detectors
Proprietăți Fizice
Fază
Solid
Densitate
13,69 g/cm3
Punct de topire
1449,15 K | 1176 °C | 2148,8 °F
Punct de fierbere
2880,15 K | 2607 °C | 4724,6 °F
Energie de fuziune
n/a
Energie de evaporare
n/a
Căldură specifică
-
Abundența în scoarța Pământului
n/a
Abundența în Univers
n/a
A
Credite imagine: Wikimedia Commons (Bionerd)
A small disc of Am-241 under the microscope
CAS Number
7440-35-9
PubChem CID Number
n/a
Proprietăți Atomice
Rază atomică
173 pm
Rază de covalență
180 pm
Electronegativitate
1,3 (Scara lui Pauling)
Potențial de ionizare
5,9738 eV
Volum molar
17,78 cm3/mol
Conductivitate termică
0,1 W/cm·K
Număr de oxidare
2, 3, 4, 5, 6
Aplicații
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
Izotopi
Izotopi stabili
-
Izotopi instabili
229Am, 231Am, 232Am, 233Am, 234Am, 235Am, 236Am, 237Am, 238Am, 239Am, 240Am, 241Am, 242Am, 243Am, 244Am, 245Am, 246Am, 247Am, 248Am, 249Am