Plutonium

Kemiallinen merkki: Pu
Järjestysluku: 94
Kategoria: aktinoidit
Ryhmä: n/a
Jakso: 7
Lohko: f
Moolimassa: (244) g/mol
Elektronia kuorilla: 2, 8, 18, 32, 24, 8, 2
CAS-numero: 7440-07-5
Olomuoto: kiinteä
Tiheys: 19,816 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 912,5 K (639,4 °C, 1182,9 °F)
Kiehumispiste: 3505 K (3228 °C, 5842 °F)
Kiderakenne: monoclinic
Hapetusluvut: 3, 4, 5, 6
Elektronegatiivisuus: 1,28 (Pauling-asteikko)
Nimen alkuperä: Pluto
Nimen tarkoitus: the planet in the Solar System
Faktoja:
- has a bright silvery appearance at first, much like nickel, but it oxidizes very quickly to a dull gray, although yellow and olive green are also reported
- is about as hard and brittle as grey cast iron unless it is alloyed with other meta
- is not a good conductor of heat or electricity
- has six allotropes, from alpha- to zeta- plutonium
- has wenty radioactive isotopes, of which the longest-lived is plutonium-244, with a half-life of 80,8 million years
- the most important isotope of plutonium is plutonium-239, with a half-life of 24,100 years
- when exposed to moist air, it forms oxides and hydrides that expand the sample up to 70% in volume, which in turn flake off as a powder that can sp
- is used in nuclear weapons and use in some nuclear reactors
- is also a radioactive poison that accumulates in bone marrow
- reacts with carbon, halogens, nitrogen and silicon