Gd - Gadolinium

This rare earth metal was discovered by J. C. G. de Marignac in 1880, who named the metal for Finnish geologist, J. Gadolin. Except for fourth period transition metals, gadolinium is the only metal to exhibit ferromagnetic properties.

Atomic number - 64 Density g/mL 7 .89

Atomic weight u 157 .25 Melting point K 1585

Bonding radius A 1 .61 Boiling point K 3539

Atomic radius A 2 .54 Heat of vaporization kJ/mol 359 .4

Ionization Potential V 6 .15 Heat of fusion kJ/mol 10 .05

Electronegativity - 1 .2 Specific heat J/gK 0 .23

The oxide is mildly basic.
Crystal are hexagonal.

Electron config. : [Xe] 4f⁷ 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 Gd: Click mass number for decay process, product for element page.

137
7 sec
EC,8.800 MeV
Eu-137
136.94460 139
4.9 sec
EC/ECp,7.700
Eu-139/Sm-138
138.93805 140
15.8 sec
EC,5.500 MeV
Eu-140
139.93397 141
14 sec
EC/ECp,7.200
Eu-141/Sm-140
140.93225 142
70.2 sec
EC,4.500 MeV
Eu-142
141.92796 143
39 sec
EC,6.010 MeV
Eu-143
142.92662 144
4.5 min
EC,3.740 MeV
Eu-144
143.92279

145
23.0 min
EC,5.050 MeV
Eu-145
144.92168 146
48.27 da
EC,1.030 MeV
Eu-146
145.91830 147
38.06 hr
EC,2.187 MeV
Eu-147
146.91908 148
74.6 yr
a,3.271 MeV
Sm-144
147.91811 149
9.28 da
a/EC,1.314
Sm-145/Eu-149
148.91933 150
1.79E+6 yr
a,2.809 MeV
Sm-146
149.91865 151
124 da
a/EC,1.187
Sm-147/Eu-151
150.92034

152 0.20%
1.08E14 yr
a,2.205 MeV
Sm-148
151.91978 153
241.6 da
EC,1.900 MeV
Eu-153
152.92174 154 2.18%

Stable

153.92086 155 14.80%

Stable

154.92261 156 20.47%

Stable

155.92211 157 15.65%

Stable

156.92395 158 24.84%

Stable

157.92410

159
18.479 hr
B-,2.514 MeV
Tb-159
158.92638 160 21.86%

Stable

159.92705 161
3.66 min
B-,1.956 MeV
Tb-161
160.92966 162
8.4 min
B-,1.390 MeV
Tb-162
161.93098 163
68 sec
B-,3.100 MeV
Tb-163
162.93397 164
45 sec
B-,2.300 MeV
Tb-164
163.93590

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	-	64		Density	g/mL	7	.89
Atomic weight	u	157	.25	Melting point	K	1585
Bonding radius	A	1	.61	Boiling point	K	3539
Atomic radius	A	2	.54	Heat of vaporization	kJ/mol	359	.4
Ionization Potential	V	6	.15	Heat of fusion	kJ/mol	10	.05
Electronegativity	-	1	.2	Specific heat	J/gK	0	.23
The oxide is mildly basic.				Crystal are hexagonal.
Electron config. : [Xe] 4f⁷ 5d¹ 6s²
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137 7 sec EC,8.800 MeV Eu-137 136.94460	139 4.9 sec EC/ECp,7.700 Eu-139/Sm-138 138.93805	140 15.8 sec EC,5.500 MeV Eu-140 139.93397	141 14 sec EC/ECp,7.200 Eu-141/Sm-140 140.93225	142 70.2 sec EC,4.500 MeV Eu-142 141.92796	143 39 sec EC,6.010 MeV Eu-143 142.92662	144 4.5 min EC,3.740 MeV Eu-144 143.92279
145 23.0 min EC,5.050 MeV Eu-145 144.92168	146 48.27 da EC,1.030 MeV Eu-146 145.91830	147 38.06 hr EC,2.187 MeV Eu-147 146.91908	148 74.6 yr a,3.271 MeV Sm-144 147.91811	149 9.28 da a/EC,1.314 Sm-145/Eu-149 148.91933	150 1.79E+6 yr a,2.809 MeV Sm-146 149.91865	151 124 da a/EC,1.187 Sm-147/Eu-151 150.92034
152 0.20% 1.08E14 yr a,2.205 MeV Sm-148 151.91978	153 241.6 da EC,1.900 MeV Eu-153 152.92174	154 2.18% Stable 153.92086	155 14.80% Stable 154.92261	156 20.47% Stable 155.92211	157 15.65% Stable 156.92395	158 24.84% Stable 157.92410
159 18.479 hr B-,2.514 MeV Tb-159 158.92638	160 21.86% Stable 159.92705	161 3.66 min B-,1.956 MeV Tb-161 160.92966	162 8.4 min B-,1.390 MeV Tb-162 161.93098	163 68 sec B-,3.100 MeV Tb-163 162.93397	164 45 sec B-,2.300 MeV Tb-164 163.93590
MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass