Einsteinium
99
Es
Grupp
Ej tillämplig
Period
7
Block
f
Protoner
Elektroner
Neutroner
99
99
153
Generella Egenskaper
Atomnummer
99
Atommassa
[252]
Masstal
252
Kategori
Aktinider
Färg
Ej tillämplig
Radioaktiv
Ja
Named after Albert Einstein
Kristallstruktur
Ej tillämplig
Historia
Einsteinium was discovered as a component of the debris of the first hydrogen bomb explosion in 1952.
It was identified by Albert Ghiorso and co-workers at the University of California, Berkeley in collaboration with the Argonne and Los Alamos National Laboratories, in the fallout from the Ivy Mike nuclear test.
The new element was produced by the nuclear explosion in miniscule amounts by the addition of 15 neutrons to uranium-238.
It was identified by Albert Ghiorso and co-workers at the University of California, Berkeley in collaboration with the Argonne and Los Alamos National Laboratories, in the fallout from the Ivy Mike nuclear test.
The new element was produced by the nuclear explosion in miniscule amounts by the addition of 15 neutrons to uranium-238.
Elektroner per skal
2, 8, 18, 32, 29, 8, 2
Elektronkonfiguration
[Rn] 5f11 7s2
Einsteinium is the first divalent metal in the actinide series
Fysikaliska Egenskaper
Aggregationstillstånd
Fast
Densitet
8,84 g/cm3
Smältpunkt
1133,15 K | 860 °C | 1580 °F
Kokpunkt
-
Smältvärme
Ej tillämplig
Ångbildningsvärme
Ej tillämplig
Specifik värmekapacitet
-
Förekomst i jordskorpan
Ej tillämplig
Förekomst i universum
Ej tillämplig
Bildkrediter: Wikimedia Commons (National Nuclear Security Administration)
Einsteinium was first observed in the fallout from the Ivy Mike nuclear test
CAS-nummer
7429-92-7
PubChem CID-nummer
Ej tillämplig
Atomära Egenskaper
Atomradie
-
Kovalent radie
-
Elektronegativitet
1,3 (Paulingskalan)
Jonisationspotential
6,42 eV
Molvolym
28,5 cm3/mol
Värmeledningsförmåga
0,1 W/cm·K
Oxidationstillstånd
2, 3
Användningsområden
Einsteinium is mainly used for scientific research purposes.
The rare isotope einsteinium-254 is favored for production of ultraheavy elements.
Einsteinium-254 was used as the calibration marker in the chemical analysis spectrometer of the Surveyor 5 lunar probe.
The rare isotope einsteinium-254 is favored for production of ultraheavy elements.
Einsteinium-254 was used as the calibration marker in the chemical analysis spectrometer of the Surveyor 5 lunar probe.
Einsteinium is harmful due to its radioactivity
Isotoper
Stabila isotoper
-Instabila isotoper
240Es, 241Es, 242Es, 243Es, 244Es, 245Es, 246Es, 247Es, 248Es, 249Es, 250Es, 251Es, 252Es, 253Es, 254Es, 255Es, 256Es, 257Es, 258Es