Einsteinium

99
Es
Grupp
n/a
Period
7
Block
f
Protoner
Electrons
Neutroner
99
99
153
Generella Egenskaper
Atomnummer
99
Atommassa
[252]
Mass Number
252
Kategori
Aktinider
Färg
n/a
Radioaktiv
Ja
Named after Albert Einstein
Kristallstruktur
n/a
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.
Elektroner per skal
2, 8, 18, 32, 29, 8, 2
Elektronkonfiguration
[Rn] 5f11 7s2
Es
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
n/a
Ångbildningsvärme
n/a
Specifik värmekapacitet
-
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
Einsteinium
Bildkrediter: Wikimedia Commons (National Nuclear Security Administration)
Einsteinium was first observed in the fallout from the Ivy Mike nuclear test
CAS Number
7429-92-7
PubChem CID Number
n/a
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
Applications
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.
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