Basic Information
Bohr Model
Static
Interactive
Descriptive Numbers
CAS Number
54083-77-1
Mendeleev Number
70
Mass
Atomic Mass
281 Da
Periodic Position
X Position
10
Y Position
7
Period
7
Group
10
Classification
Block
d
Category
Unknown
Goldschmidt
Synthetic
Atomic Radius
Covalent (Triple Bound)
112
Covalent (Pyykko)
128
Covalent (Pyykko Double)
116
Covalent (Pyykko Triple)
118
Density
STP
34.8 kg/cm³
Heat
Adiabatic Index
N/A
Etymology
Language Of Origin
German
Origin Of Word
The element was first synthesized in Darmstadt, Germany.
Meaning
Proper noun. Literal meaning: "intestinal city"
Symbol Origin
place name
Etymological Description
It is named after the city of Darmstad (GSI Helmholtz Heavy Ion Research Center in the Wihausen district) where it was discovered. It is also known by the names eka-platinum and ununnillium (Uun), which was temporarily given by the International Union of Applied Fundamentals and Chemistry.
Discovery & Isolation
Observed/Predicted By
S. Hofmann et al. (at GSI in Darmstadt)
Observed/Discovery Year
1994
Discovery Location
Isolated Sample By
GSI Helmholtz Center for Heavy Ion Research
Production & Use
Sources
It is obtained by bombarding bismuth-209 with cobalt-59.
Uses
It has no significant commercial use.
Radioactivity
Half Life
4 minutes
Lifetime
5.833 minutes
Decay Mode
Alpha Six
Dipole Polarity
Accepted
32
Uncertainty
3
Electron & Quantum
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d8
Quantum Number
Ad
Electron Configuration Semantic
*[Rn] 5f14 6d9 7s1
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
32
Shells-4
32
Shells-5
16
Shells-6
2
