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.

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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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