Lr - Lawrencium

Lawrencium was discovered in 1961 by Ghiorso, Sikkeland, Larsh and Latimer at Berkeley. The longest lived isotope, Lr256 forms +3 ions.

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

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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
H He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr
Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe
Cs Ba La* Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn
Fr Ra Ac** Rf Db Sg Bh Hs Mt 110 111 112 113
Lanthanides* Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu
Actinides ** Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr

Isotopes of Lr: Click mass number for decay process, product for element page.
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 		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 		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 		MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Updated by clh on 2/6/98. This is not a publication of Phoenix College.