Einsteinium

99
Es
Gruppe
n/a
Periode
7
Blok
f
Protons
Electrons
Neutrons
99
99
153
General Properties
Atomnummer
99
Atommasse
[252]
Mass Number
252
Kategori
Actinider
Farve
n/a
Radioactive
Ja
Named after Albert Einstein
Krystalstruktur
n/a
History
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 i hver skal
2, 8, 18, 32, 29, 8, 2
Elektronkonfiguration
[Rn] 5f11 7s2
Es
Einsteinium is the first divalent metal in the actinide series
Physical Properties
Tilstandsform
Fast stof
Massefylde
8,84 g/cm3
Smeltepunkt
1133,15 K | 860 °C | 1580 °F
Kogepunkt
-
Smeltevarme
n/a
Fordampningsvarme
n/a
Varmefylde
-
Abundance in Earth's crust
n/a
Abundance in Universe
n/a
Einsteinium
Billede akkrediteringer: 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
Atomic Properties
Atomradius
-
Kovalent radius
-
Elektronegativitet
1,3 (Paulings skala)
Ionization Potential
6,42 eV
Atomic Volume
28,5 cm3/mol
Varmeledningsevne
0,1 W/cm·K
Oxidationstrin
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
Stable Isotopes
-
Unstable Isotopes
240Es, 241Es, 242Es, 243Es, 244Es, 245Es, 246Es, 247Es, 248Es, 249Es, 250Es, 251Es, 252Es, 253Es, 254Es, 255Es, 256Es, 257Es, 258Es