Basic Information
Bohr Model
Static
Interactive
Descriptive Numbers
CAS Number
54037-57-9
Mendeleev Number
62
Mass
Atomic Mass
269 Da
Periodic Position
X Position
8
Y Position
7
Period
7
Group
8
Classification
Block
d
Category
Transition Metal
Goldschmidt
Synthetic
Color
Jmol
#E6002E
Molcas Gv
#E6002E
Atomic Radius
Covalent (Triple Bound)
118
Covalent (Pyykko)
134
Covalent (Pyykko Double)
125
Covalent (Pyykko Triple)
118
Temperature
Melting/Freeze (USE)
126 °K
Density
STP
40.7 kg/cm³
Heat
Adiabatic Index
N/A
Etymology
Description
It is a radioactive transition metal that was first synthesized by a German research team led by Peter Armbruster and Gottfried Muenzenberg at the Center for Heavy Ion Research in Darmstadt.
Language Of Origin
Latin
Origin Of Word
From Hesse, Germany, where the element was first synthesized
Symbol Origin
place name
Etymological Description
It is derived from Hassia, the Latin word for the state of Hesse (Heavy Ion Research Center in Darmstad) where it was discovered in Germany. It is also known by the names eka-osmium and uniloctium (Uno), provisionally given by the International Union of Applied Fundamentals and Chemistry.
Discovery & Isolation
Observed/Predicted By
G. Münzenberg, P. Armbruster et al. (at GSI in Darmstadt)
Observed/Discovery Year
1984
Discovery Location
Isolated Sample By
GSI Helmholtz Center for Heavy Ion Research
Production & Use
Sources
It is obtained by bombarding lead-208 with iron-58.
Uses
It has no significant commercial use.
Radioactivity
Half Life
1.11 seconds
Lifetime
1.39 seconds
Decay Mode
Alpha Six
Dipole Polarity
Accepted
36
Uncertainty
4
Electron & Quantum
Oxidation States
8
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d6
Quantum Number
5D4
Electron Configuration Semantic
*[Rn] 5f14 6d6 7s2
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
32
Shells-4
32
Shells-5
14
Shells-6
2
