Basic Information
Bohr Model
Static
Interactive
Descriptive Numbers
CAS Number
7440-71-3
Mendeleev Number
32
Pettifor Number
39
Space Group Number
194
Glawe Number
42
Mass
Atomic Mass
251 Da
Periodic Position
X Position
13
Y Position
9
Period
7
Group
N/A
Classification
Block
f
Category
Actinides
Goldschmidt
Synthetic
Color
Jmol
#A136D4
Molcas Gv
#A136D4
CPK
#FFFFFF
Atomic Radius
Uff
331.3
Alvarez
305
Covalent (Pyykko)
168
Covalent (Pyykko Double)
140
Metallic
186+/- 2
Temperature
Melting/Freeze (USE)
1173 °K
Melting/Freeze (WEL)
1173 °K
Melting/Freeze (CRC)
1173 °K
Melting/Freeze (LNG)
1173 °K
Boiling/Density (USE)
1743 °K
Density
STP
15.1 kg/cm³
Solid (WEL)
15100 kg/cm³
Solid (CRC)
15100 kg/cm³
Heat
Molar Volume
16.5 cm³/mol
Adiabatic Index
N/A
Etymology
Description
It is a transuranic, radioactive metal element. It is found in the actinides class. Cf-251 has a half-life of around 700 years. There are nine known isotopes. Cf-252 is a dense neutron source. In this way, it can be used in neutron activation analysis and as a radiation source in medicine. It was first obtained by Glenn T. Seaborg and his colleagues in 1950.
Language Of Origin
English
Origin Of Word
From the state of California where the element was first synthesized
Symbol Origin
place name: state and university of california
Etymological Description
It is named after the US state of California and the University of California, Berkeley (the origin of the state's name is disputed).
Discovery & Isolation
Observed/Predicted By
S. G. Thompson, K. Street, Jr., A. Ghiorso ve G. T. Seaborg (Berkeley)
Observed/Discovery Year
1950
Isolated Sample By
Lawrence Berkeley National Laboratory
Production & Use
Sources
It is obtained by bombarding curium with helium ions.
Uses
It has no significant commercial use.
Radioactivity
Half Life
900.6 years
Lifetime
1.3×10^3 years
Decay Mode
Alpha Six
Neutron Cross Section
2.9×103
Electron Affinity
Electron Affinity (kJ/mol)
-97.31
Electron Affinity (pauling)
1.3
Electron Affinity (ghosh)
0.20369
Dipole Polarity
Accepted
122
Uncertainty
20
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 5f10
Quantum Number
5I8
Electron Configuration Semantic
[Rn] 5f10 7s2
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
32
Shells-4
28
Shells-5
8
Shells-6
2
Ionization Energies-0
608
