Mendeleev's Periodic Table > Lr - Lawrencium

Lr - Lawrencium

Lawrencium was discovered in 1961 by Ghiorso, Sikkeland, Larsh and Latimer at Berkeley. The longest lived isotope, Lr256 forms +3 ions. Lawrencium is a synthetic "rare earth metal" which does not occur in the environment.

Atomic number - 103 Density g/mL -
Atomic weight u 260 Melting point K -
Bonding radius A - Boiling point K -
Atomic radius A - Heat of vaporization kJ/mol -
Ionization Potential V - Heat of fusion kJ/mol -
Electronegativity - - Specific heat J/gK -
The oxide is unknown. Crystal are unknown.
Electron config. : [Rn] 5f14 6d1 7s2

Isotopes of Lr (Lawrencium) :

MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 252
1 sec
a/EC/SF,9.150
Md-248/No-252/?
252.0 		253
1.3 sec
a/EC/SF,8.990
Md-249/No-253/?
253.09522 		254
13 sec
a/EC/SF,8.750
Md-250/No-254/?
254.09651 		255
22 sec
a/EC,8.620
Md-251/No-255
255.09671
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 256
28 sec
a/EC/SF,8.880
Md-252/No-256/?
256.09876 		257
0.646 sec
a/SF,9.010
Md-253/?
257.09954 		258
3.9 sec
a/EC/SF,8.900
Md-254/No-258/?
258.10187 		259
6.1 sec
a/EC/SF,8.670
Md-255/No-259/?
259.10298
MASS abundancy
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass		 260
180 sec
a/EC/SF,8.310
Md-256/No-260/?
260.10557 		261
39 min
SF,2.740 MeV
?
261.10692 		262
3.6 hr
EC/SF,2.100
No-262/?
262.10982