Basic Information
Bohr Model
Static
Interactive
Descriptive Numbers
CAS Number
22537-19-5
Mendeleev Number
42
Pettifor Number
34
Glawe Number
47
Mass
Atomic Mass
266 Da
Periodic Position
X Position
18
Y Position
9
Period
7
Group
3
Classification
Block
f
Category
Actinides
Goldschmidt
Synthetic
Color
Jmol
#C70066
Molcas Gv
#C70066
CPK
#FFFFFF
Atomic Radius
Uff
323.6
Covalent (Pyykko)
161
Covalent (Pyykko Double)
141
Temperature
Melting/Freeze (USE)
1900 °K
Melting/Freeze (WEL)
1900 °K
Melting/Freeze (CRC)
1900 °K
Melting/Freeze (LNG)
1900 °K
Heat
Adiabatic Index
N/A
Etymology
Description
Its appearance is unknown, but it is most likely silvery-white or gray and metal. Lawrencium is a synthetic rare earth metal. There are eight known radioisotopes. Lr-262 is the most stable with a half-life of 3.6 hours. Lawrencium has no known uses due to its short half-life and radioactivity. It was discovered by Albert Ghiorso in Berkeley in 1961. It was obtained by bombarding californium with boron ions. The name element is a provisional term given by the International Union of Pure and Applied Chemistry. Its origin comes from Ernest O. Lawrence, the inventor of the cyclotron. If obtained in sufficient quantities, it poses a radiation risk.
Origin Of Word
From physicist Ernest O. Lawrence
Symbol Origin
surname, eponym
Etymological Description
This name was given in honor of Ernest O. Lawrence, who took part in the development of the cyclotron. Its symbol has been Lr since 1963. Its previous symbol was Lw.
Discovery & Isolation
Observed/Predicted By
A. Ghiorso, T. Sikkeland, E. Larsh and M. Latimer (Berkeley Radiation Laboratory)
Observed/Discovery Year
1961
Isolated Sample By
Lawrence Berkeley National Laboratory
Production & Use
Sources
It is obtained by bombarding californium with boron ions.
Uses
It has no significant commercial use.
Radioactivity
Half Life
10 seconds
Lifetime
14.4 seconds
Decay Mode
Alpha Six
Electron Affinity
Electron Affinity (kJ/mol)
-30.04
Electron Affinity (pauling)
1.3
Electron Affinity (ghosh)
0.24844
Dipole Polarity
Accepted
320
Uncertainty
20
Electron & Quantum
Oxidation States
3
Electron Configuration
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 7p1
Quantum Number
2b1/a
Electron Configuration Semantic
[Rn] 5f14 7s2 7p1
Shells-0
2
Shells-1
8
Shells-2
18
Shells-3
32
Shells-4
32
Shells-5
8
Shells-6
3
Ionization Energies-0
470
