Einsteinium

99
Es
Gruppe
I/T
Periode
7
Blokk
f
Protoner
Elektroner
Nøytroner
99
99
153
Generelle egenskaper
Atomnummer
99
Atomvekt
[252]
Massetall
252
Kategori
Aktinoider
Farge
I/T
Radioaktiv
Ja
Named after Albert Einstein
Krystallstruktur
I/T
Historie
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 energinivå
2, 8, 18, 32, 29, 8, 2
Elektronkonfigurasjon
[Rn] 5f11 7s2
Es
Einsteinium is the first divalent metal in the actinide series
Fysikalske egenskaper
Fase
Fast stoff
Tetthet
8,84 g/cm3
Smeltepunkt
1133,15 K | 860 °C | 1580 °F
Kokepunkt
-
Smeltevarme
I/T
Fordampningsvarme
I/T
Spesifikk varmekapasitet
-
Forekomst i jordskorpa
I/T
Forekomst i universet
I/T
Einsteinium
Bildekreditter: 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
I/T
Atomegenskaper
Atomradius
-
Kovalent radius
-
Elektronegativitet
1,3 (Pauling-skalaen)
Ioniseringsenergi
6,42 eV
Molart volum
28,5 cm3/mol
Termisk ledningsevne
0,1 W/cm·K
Oksidasjonstilstander
2, 3
Bruksområder
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
Stabile isotoper
-
Ustabile isotoper
240Es, 241Es, 242Es, 243Es, 244Es, 245Es, 246Es, 247Es, 248Es, 249Es, 250Es, 251Es, 252Es, 253Es, 254Es, 255Es, 256Es, 257Es, 258Es