Amerikium

Kemiallinen merkki: Am
Järjestysluku: 95
Kategoria: aktinoidit
Ryhmä: n/a
Jakso: 7
Lohko: f
Moolimassa: (243) g/mol
Elektronia kuorilla: 2, 8, 18, 32, 25, 8, 2
CAS-numero: 7440-35-9
Olomuoto: kiinteä
Tiheys: 12 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 1449 K (1176 °C, 2149 °F)
Kiehumispiste: 2880 K (2607 °C, 4725 °F)
Kiderakenne: hexagonal
Hapetusluvut: 3, 4, 5, 6
Elektronegatiivisuus: 1,3 (Pauling-asteikko)
Nimen alkuperä: America
Nimen tarkoitus: by analogy with europium which was named after Europe
Faktoja:
- has a silvery and white luster
- slowly tarnishes in dry air
- is more silvery than plutonium or neptunium and apparently more malleable than neptunium or uranium
- is unlikely that Americium would be used as a weapons material, as its minimum critical mass is considerably larger than that of more readily obtained plutonium or uranium isotopes
- is widely used in commercial ionization-chamber smoke detectors as well as in neutron sources and industrial gauges
- eighteen radioisotopes of americium have been characterized, with the most stable being americium-243 with a half-life of
- americium-241 has recently been suggested for use as a denaturing agent in plutonium reactor fuel rods to render the fuel unusable for conversion to nuclear weapons