Tb - Terbium

Terbium was discovered by Mosander in 1843 in Stockholm. One of four elements named for the Swedish town of Ytterby.

Atomic number - 65 Density g/mL 8 .27

Atomic weight u 158 .9254 Melting point K 1630

Bonding radius A 1 .59 Boiling point K 3496

Atomic radius A 2 .51 Heat of vaporization kJ/mol 330 .9

Ionization Potential V 5 .86 Heat of fusion kJ/mol 10 .8

Electronegativity - 1 .2 Specific heat J/gK 0 .18

The oxide is a weak base.
Crystal are hexagonal.

Electron config. : [Xe] 4f⁹ 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 Tb: Click mass number for decay process, product for element page.

140
2.4 sec
EC/p,10.800
Gd-140/Gd-139
139.94557 141
3.5 sec
EC,8.300 MeV
Gd-141
140.94116 142
597 msec
EC/ECp,10.100
Gd-142/Eu-141
141.93870 143
12 sec
EC,7.400 MeV
Gd-143
142.93451 144
1 sec
EC,8.900 MeV
Gd-144
143.93236 145
31.6 sec
EC,6.510 MeV
Gd-145
144.92867 146
8 sec
EC,8.080 MeV
Gd-146
145.92697

147
1.7 hr
EC,4.609 MeV
Gd-147
146.92403 148
60 min
EC,5.690 MeV
Gd-148
147.92421 149
4.118 hr
a/EC,3.636
Eu-145/Gd-149
148.92324 150
3.48 hr
a/EC,4.656
Eu-146/Gd-150
149.92365 151
17.609 hr
a/EC,2.565
Eu-147/Gd-151
150.92309 151a
25 sec
EC,2.664 MeV
Gd-151
150.92320 152
17.5 hr
a/EC,3.990
Eu-148/Gd-152
151.92406

153
2.34 da
EC,1.570 MeV
Gd-153
152.92343 154
21.5 hr
B-/EC,3.560
Dy-154/Gd-154
153.92469 155
5.32 da
EC,1.627 MeV
Gd-155
154.92350 156
5.35 da
B-/EC,2.444
Dy-156/Gd-156
155.92474 157
71 yr
EC,1.363 MeV
Gd-157
156.92402 158
180 yr
B-/EC,1.220
Dy-158/Gd-158
157.92541 158a
10.70 sec
EC,1.330 MeV
Gd-158
157.92552

159 100%

Stable

158.92534 160
72.3 da
B-,1.835 MeV
Dy-160
159.92716 161
6.88 da
B-,1.956 MeV
Dy-161
160.92756 162
7.60 min
B-,2.510 MeV
Dy-162
161.92948 163
19.5 min
B-,1.785 MeV
Dy-163
162.93064 164
3.0 min
B-,3.890 MeV
Dy-164
163.93334 165
2.11 min
B-,3.000 MeV
Dy-165
164.93483

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	-	65		Density	g/mL	8	.27
Atomic weight	u	158	.9254	Melting point	K	1630
Bonding radius	A	1	.59	Boiling point	K	3496
Atomic radius	A	2	.51	Heat of vaporization	kJ/mol	330	.9
Ionization Potential	V	5	.86	Heat of fusion	kJ/mol	10	.8
Electronegativity	-	1	.2	Specific heat	J/gK	0	.18
The oxide is a weak base.				Crystal are hexagonal.
Electron config. : [Xe] 4f⁹ 6s²
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140 2.4 sec EC/p,10.800 Gd-140/Gd-139 139.94557	141 3.5 sec EC,8.300 MeV Gd-141 140.94116	142 597 msec EC/ECp,10.100 Gd-142/Eu-141 141.93870	143 12 sec EC,7.400 MeV Gd-143 142.93451	144 1 sec EC,8.900 MeV Gd-144 143.93236	145 31.6 sec EC,6.510 MeV Gd-145 144.92867	146 8 sec EC,8.080 MeV Gd-146 145.92697
147 1.7 hr EC,4.609 MeV Gd-147 146.92403	148 60 min EC,5.690 MeV Gd-148 147.92421	149 4.118 hr a/EC,3.636 Eu-145/Gd-149 148.92324	150 3.48 hr a/EC,4.656 Eu-146/Gd-150 149.92365	151 17.609 hr a/EC,2.565 Eu-147/Gd-151 150.92309	151a 25 sec EC,2.664 MeV Gd-151 150.92320	152 17.5 hr a/EC,3.990 Eu-148/Gd-152 151.92406
153 2.34 da EC,1.570 MeV Gd-153 152.92343	154 21.5 hr B-/EC,3.560 Dy-154/Gd-154 153.92469	155 5.32 da EC,1.627 MeV Gd-155 154.92350	156 5.35 da B-/EC,2.444 Dy-156/Gd-156 155.92474	157 71 yr EC,1.363 MeV Gd-157 156.92402	158 180 yr B-/EC,1.220 Dy-158/Gd-158 157.92541	158a 10.70 sec EC,1.330 MeV Gd-158 157.92552
159 100% Stable 158.92534	160 72.3 da B-,1.835 MeV Dy-160 159.92716	161 6.88 da B-,1.956 MeV Dy-161 160.92756	162 7.60 min B-,2.510 MeV Dy-162 161.92948	163 19.5 min B-,1.785 MeV Dy-163 162.93064	164 3.0 min B-,3.890 MeV Dy-164 163.93334	165 2.11 min B-,3.000 MeV Dy-165 164.93483
MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass