Einsteinium

Kemiallinen merkki: Es
Järjestysluku: 99
Kategoria: aktinoidit
Ryhmä: n/a
Jakso: 7
Lohko: f
Moolimassa: (252) g/mol
Elektronia kuorilla: 2, 8, 18, 32, 29, 8, 2
CAS-numero: 7429-92-7
Olomuoto: kiinteä
Tiheys: 8,84 kg/l (lähellä huoneenlämpöä)
Sulamispiste: 1133 K (860 °C, 1580 °F)
Kiehumispiste: unknown
Kiderakenne: unknown
Hapetusluvut: 2, 3, 4
Elektronegatiivisuus: 1,3 (Pauling-asteikko)
Nimen alkuperä: Albert Einstein
Nimen tarkoitus: in honor of the theoretical physicist
Faktoja:
- is a metallic synthetic element
- its chemical and physical properties are similar to other metals
- though only small amounts have ever been made, it has been determined to be silver-colored
- like all synthetic elements, isotopes of einsteinium are extremely radioactive, and are considered highly toxic
- does not occur naturally in any measurable quantities
- the modern process of creating the element starts with the irradiation of plutonium-239 in a nuclear reactor for several years
- has no known uses, other than radioactivity
- nineteen radioisotopes of einsteinium have been characterized, with the most stable being einsteinium-252 with a half-life of 471,7 days