Basic Information
Bohr Model
Static
Interactive
Descriptive Numbers
CAS Number
53850-35-4
Mendeleev Number
50
Mass
Atomic Mass
268 Da
Periodic Position
X Position
5
Y Position
7
Period
7
Group
5
Classification
Block
d
Category
Transition Metal
Goldschmidt
Synthetic
Color
Jmol
#D1004F
Molcas Gv
#D1004F
Atomic Radius
Covalent (Triple Bound)
126
Covalent (Pyykko)
149
Covalent (Pyykko Double)
136
Covalent (Pyykko Triple)
126
Density
STP
29.3 kg/cm³
Heat
Adiabatic Index
N/A
Etymology
Description
Also known as Hahnium (Ha). It has a half-life of 1.6 seconds. It was discovered by researchers at Berkeley in 1970. So far, seven isotopes have been found.
Language Of Origin
Russian
Origin Of Word
Rusya Dubna'dan
Symbol Origin
place name
Etymological Description
It is named after the city of Dubna (Joint Institute for Nuclear Research, USSR) where it was discovered. Researchers at the University of California, Berkeley, proposed the name hahnium in honor of Otto Hahn for his pioneering work in radioactivity and radiochemistry, but the name was rejected. Unilpentium was used as a provisional systematic name.
Discovery & Isolation
Observed/Predicted By
A. Ghiorso et al. (Berkeley Radiation Laboratory) and V. A. Druin et al. (at ONAE in Dubna)
Observed/Discovery Year
1970
Isolated Sample By
Joint Institute for Nuclear Research
Production & Use
Sources
It is obtained by bombarding californium-249 with nitrogen-15.
Uses
It has no significant commercial use.
Radioactivity
Half Life
5.56 seconds
Lifetime
8.33 seconds
Decay Mode
Alpha Six
Dipole Polarity
Accepted
42
Uncertainty
4
Electron & Quantum
Oxidation States
5
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d3
Quantum Number
4F3/2
Electron Configuration Semantic
*[Rn] 5f14 6d3 7s2
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
32
Shells-4
32
Shells-5
11
Shells-6
2
