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Lu - Lutetium

A rare earth metal discovered in 1907 by Urbain in France and James at the University of New HAmpshire. The emission spectrum of lutetium may be observed with the emission spectroscope in general chemistry lab.

Atomic number - 71 Density g/mL 9 .84
Atomic weight u 174 .967 Melting point K 1936
Bonding radius A 1 .56 Boiling point K 3668
Atomic radius A 2 .25 Heat of vaporization kJ/mol 355 .9
Ionization Potential V 5 .43 Heat of fusion kJ/mol 18 .6
Electronegativity - 1 .27 Specific heat J/gK 0 .15
The oxide is a weak base.
Crystal are hexagonal.

Electron config. : [Xe] 4f14 5d1 6s2

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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 Lu: Click mass number for decay process, product for element page.
150
35 msec
p,1.270 MeV
Yb-149
149.97262
151
88 msec
p,1.240 MeV
Yb-150
150.96714
152
0.7 sec
EC/ECp,12.500
Yb-152/Tm-151
151.96360
153

p,6.700 MeV
Yb-152
152.95866
154
1.12 sec
EC,10.100 MeV
Yb-154
153.95705
155
140 msec
a/EC,5.337
Tm-151/Yb-155
154.95415
156
0.73 sec
a/EC,5.590
Tm-152/Yb-156
155.95287
157
6.8 sec
a/EC,5.096
Tm-153/Yb-157
156.95010
158
10.6 sec
a/EC,8.670
Tm-154/Yb-158
157.94916
159
12.1 sec
a/EC,5.990
Tm-155/Yb-159
158.94666
160
36.1 sec
a/EC,7.880
Tm-156/Yb-160
159.94602
161
72 sec
EC,5.300 MeV
Yb-161
160.94354
162
1.37 min
EC,7.220 MeV
Yb-162
161.94349
163
238 sec
EC,4.600 MeV
Yb-163
162.94120
164
3.14 min
EC,6.250 MeV
Yb-164
163.94123
165
10.74 min
EC,3.920 MeV
Yb-165
164.93960
166
2.65 min
EC,5.480 MeV
Yb-166
165.93976
167
51.5 min
EC,3.130 MeV
Yb-167
166.93830
168
5.5 min
EC,4.480 MeV
Yb-168
167.93870
169
34.06 hr
EC,2.293 MeV
Yb-169
168.93764
170
2.012 da
EC,3.459 MeV
Yb-170
169.93847
171
8.24 da
EC,1.479 MeV
Yb-171
170.93791
172
6.70 da
EC,2.519 MeV
Yb-172
171.93908
173
1.37 yr
EC,1.298 MeV
Yb-173
172.93892
174
3.31 yr
EC,1.374 MeV
Yb-174
173.94033
174a
142 da
EC,1.545 MeV
Yb-174
173.94051
175 97.41%

Stable

174.94076
176 2.59%
3.78E10 yr
B-/EC,1.193
Hf-176/Yb-176
175.94268
177
6.734 da
B-,1.399 MeV
Hf-177
176.94375
178
28.4 min
B-,2.099 MeV
Hf-178
177.94595
179
4.59 hr
B-,1.405 MeV
Hf-179
178.94732
180
5.7 min
B-,3.100 MeV
Hf-180
179.94987
181
3.5 min
B-,2.500 MeV
Hf-181
180.95179
182
2.0 min
B-,2.500 MeV
Hf-182
181.95533
183
58 sec
B-,2.500 MeV
Hf-183
182.95732
184
20 sec
B-,2.500 MeV
Hf-184
183.96125
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.

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