Einsteiniu

99
Es
Grupă
n/a
Perioadă
7
Bloc
f
Protoni
Electroni
Neutroni
99
99
153
Proprietăți Generale
Număr atomic
99
Masă atomică
[252]
Numar de masa
252
Categorie
Actinide
Culoare
n/a
Radioactive
Da
Numit după Albert Einstein
Structură cristalină
n/a
Istoric
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.
Electroni pe nivelul de energie
2, 8, 18, 32, 29, 8, 2
Configurație electronică
[Rn] 5f11 7s2
Es
Einsteinium is the first divalent metal in the actinide series
Proprietăți Fizice
Fază
Solid
Densitate
8,84 g/cm3
Punct de topire
1133,15 K | 860 °C | 1580 °F
Punct de fierbere
-
Energie de fuziune
n/a
Energie de evaporare
n/a
Căldură specifică
-
Abundența în scoarța Pământului
n/a
Abundența în Univers
n/a
Einsteinium
Credite imagine: 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
Proprietăți Atomice
Rază atomică
-
Rază de covalență
-
Electronegativitate
1,3 (Scara lui Pauling)
Potențial de ionizare
6,42 eV
Volum molar
28,5 cm3/mol
Conductivitate termică
0,1 W/cm·K
Număr de oxidare
2, 3
Aplicații
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
Izotopi
Izotopi stabili
-
Izotopi instabili
240Es, 241Es, 242Es, 243Es, 244Es, 245Es, 246Es, 247Es, 248Es, 249Es, 250Es, 251Es, 252Es, 253Es, 254Es, 255Es, 256Es, 257Es, 258Es