Tm - Thulium

Thulium was discovered in erbium ore in 1879 by Per Cleve in Sweden.

Atomic number - 69 Density g/mL 9 .33
Atomic weight u 168 .9342 Melting point K 1818
Bonding radius A 1 .56 Boiling point K 2220
Atomic radius A 2 .42 Heat of vaporization kJ/mol 191
Ionization Potential V 6 .184 Heat of fusion kJ/mol 16 .84
Electronegativity - 1 .25 Specific heat J/gK 0 .16
The oxide is a weak base.
Crystal are hexagonal.

Electron config. : [Xe] 4f13 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 Tm: Click mass number for decay process, product for element page.
146
62 msec
p,1.128 MeV
Er-145
145.96693 		147
0.559 sec
EC/p,10.700
Er-147/Er-146
146.96092 		147a
0.39 msec
p,1.061 MeV
Er-146
146.96092 		148
0.7 sec
EC,12.000 MeV
Er-148
147.95727 		149
0.9 sec
EC/ECp,9.600
Er-149/Ho-148
148.95233 		150
2.2 sec
EC,11.100 MeV
Er-150
149.94965 		151
4.17 sec
EC,7.400 MeV
Er-151
150.94543
152
8.0 sec
EC,8.600 MeV
Er-152
151.94428 		153
1.48 sec
a/EC,5.248
Ho-149/Er-153
152.94202 		154
8.1 sec
a/EC,8.050
Ho-150/Er-154
153.94142 		155
21.6 sec
a/EC,5.580
Ho-151/Er-155
154.93919 		156
83.8 sec
a/EC,7.200
Ho-152/Er-156
155.93892 		157
3.63 min
EC,4.480 MeV
Er-157
156.93675 		158
3.98 min
EC,6.600 MeV
Er-158
157.93699
159
9.13 min
EC,3.850 MeV
Er-159
158.93481 		160
9.4 min
EC,5.600 MeV
Er-160
159.93505 		161
30.2 min
EC,3.160 MeV
Er-161
160.93339 		162
21.70 min
EC,4.810 MeV
Er-162
161.93393 		163
1.810 hr
EC,2.439 MeV
Er-163
162.93264 		164
2.0 min
EC,3.962 MeV
Er-164
163.93345 		165
30.06 hr
EC,1.592 MeV
Er-165
164.93243
166
7.70 hr
EC,3.040 MeV
Er-166
165.93355 		167
9.25 da
EC,1.007 MeV
Er-167
166.93284 		168
93.1 da
B-/EC,1.679
Yb-168/Er-168
167.93417 		169 100%

Stable

168.93421 		170
128.6 da
B-/EC,3.990
Yb-170/Er-170
169.93579 		171
1.92 yr
B-,1.490 MeV
Yb-171
170.93642 		172
63.6 hr
B-,1.880 MeV
Yb-172
171.93839
173
8.24 hr
B-,1.298 MeV
Yb-173
172.93960 		174
5.4 min
B-,3.080 MeV
Yb-174
173.94216 		175
15.2 min
B-,2.390 MeV
Yb-175
174.94383 		176
1.9 min
B-,3.880 MeV
Yb-176
175.94673 		177
85 sec
B-,3.200 MeV
Yb-177
176.94868 		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.