Basic Information
Bohr Model
Static
Interactive
Descriptive Numbers
CAS Number
7440-40-6
CID Number
{CID23971, CID23971}
Mendeleev Number
30
Pettifor Number
40
Space Group Number
194
Glawe Number
41
Mass
Atomic Mass
247 Da
Periodic Position
X Position
12
Y Position
9
Period
7
Group
N/A
Classification
Block
f
Category
Actinides
Goldschmidt
Synthetic
Color
Jmol
#8A4FE3
Molcas Gv
#8A4FE3
CPK
#FFFFFF
Atomic Radius
Uff
333.9
Alvarez
340
Covalent (Pyykko)
168
Covalent (Pyykko Double)
139
Metallic
170
Temperature
Melting/Freeze (USE)
1259 °K
Melting/Freeze (CRC)
1323 °K
Melting/Freeze (LNG)
1323 °K
Boiling/Density (USE)
2900 °K
Density
STP
14.78 kg/cm³
Solid (WEL)
14780 kg/cm³
Solid (CRC)
14780 kg/cm³
Solid (LNG)
14780 kg/cm³
Heat
Molar Volume
16.84 cm³/mol
Adiabatic Index
N/A
Etymology
Description
It is a transuranic, radioactive metal element. It is in the actinides class. There are eight known isotopes, with the most common Bk-247 having a half-life of 1.4*10^3 years. It was first obtained in 1949 by bombarding americium-241 with alpha particles by Glenn T. Seaborg and his colleagues.
Language Of Origin
Old English via Modern English
Origin Of Word
Similar to terbium, from Berkeley, California, where the element was first synthesized
Symbol Origin
place name: Berkeley, California
Etymological Description
It is named after the University of California, Berkeley, where it was discovered. The name of the city located in California was given in honor of the philosopher and clergyman George Berkeley. The word Berkeley comes from the Old English beorce léah, meaning "beech (tree) meadow".
Discovery & Isolation
Observed/Predicted By
G. Thompson, A. Ghiorso and G. T. Seaborg (University of California, Berkeley)
Observed/Discovery Year
1949
Isolated Sample By
Lawrence Berkeley National Laboratory
Production & Use
Sources
Some of its compounds have been produced and studied. It is obtained by bombarding americium with alpha particles.
Uses
It has no significant commercial use.
Radioactivity
Half Life
1379 years
Lifetime
1991 year
Decay Mode
Alpha Six
Neutron Cross Section
710
Electron Affinity
Electron Affinity (kJ/mol)
-165.24
Electron Affinity (pauling)
1.3
Electron Affinity (ghosh)
0.19315
Dipole Polarity
Accepted
125
Uncertainty
25
Lattice
Angles
π/2, π/2, 2 π/3
Electron & Quantum
Oxidation States
2,3,4,5
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f9
Quantum Number
6H15/2
Electron Configuration Semantic
[Rn] 5f9 7s2
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
32
Shells-4
27
Shells-5
8
Shells-6
2
Ionization Energies-0
601
