Sm - Samarium

Samarium was discovered by Lecoq de Boisbaudrain in 1879 in Paris.

Atomic number - 62 Density g/mL 7 .54

Atomic weight u 150 .4 Melting point K 1345

Bonding radius A 1 .62 Boiling point K 2064

Atomic radius A 2 .59 Heat of vaporization kJ/mol 166 .4

Ionization Potential V 5 .64 Heat of fusion kJ/mol 8 .63

Electronegativity - 1 .17 Specific heat J/gK 0 .2

The oxide is mildly basic.
Crystal are rhombohedral.

Electron config. : [Xe] 4f⁶ 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 Sm: Click mass number for decay process, product for element page.

131
1.2 sec
EC/ECp,4.300
Pm-131/Nd-130
130.94494 132
4.0 sec
EC/ECp,5.500
Pm-132/Nd-131
131.93991 133
3.7 sec
EC/ECp,7.000
Pm-133/Nd-132
132.93870 134
10 sec
EC,5.400 MeV
Pm-134
133.93397 135
10.3 sec
EC/ECp,7.200
Pm-135/Nd-134
134.93236 136
47 sec
EC,4.500 MeV
Pm-136
135.92828 137
45 sec
EC,6.100 MeV
Pm-137
136.92710

138
3.1 min
EC,3.900 MeV
Pm-138
137.92356 139
2.57 min
EC,5.460 MeV
Pm-139
138.92264 140
14.82 min
EC,3.020 MeV
Pm-140
139.91908 141
10.2 min
EC,4.543 MeV
Pm-141
140.91847 142
72.49 min
EC,2.090 MeV
Pm-142
141.91519 143
8.83 min
EC,3.443 MeV
Pm-143
142.91462 144 3.1%

Stable

143.91199

145
340 da
EC,2.322 MeV
Pm-145
144.91340 146
10.3E+7 yr
a,2.529 MeV
Nd-142
145.91303 147 15.0%
1.06E+11 yr
a,2.310 MeV
Nd-143
146.91489 148 11.3%
7E+15 yr
a,1.986 MeV
Nd-144
147.91481 149 13.8%
2E+15 yr
a,1.071 MeV
Nd-145
148.91718 150 7.4%

Stable

149.91727 151
90 yr
B-,1.187 MeV
Eu-151
150.91992

152 26.7%

Stable

151.91972 153
46.27 hr
B-,1.900 MeV
Eu-153
152.92209 154 22.7%

Stable

153.92220 155
22.3 min
B-,1.627 MeV
Eu-155
154.92463 156
9.4 hr
B-,5.160 MeV
Eu-156
155.92552 157
482 sec
B-,2.730 MeV
Eu-157
156.92835 158
5.30 min
B-,1.999 MeV
Eu-158
157.92998

159
11.37 sec
B-,3.800 MeV
Eu-159
158.93322 160
9.6 sec
B-,3.000 MeV
Eu-160
159.93515 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	-	62		Density	g/mL	7	.54
Atomic weight	u	150	.4	Melting point	K	1345
Bonding radius	A	1	.62	Boiling point	K	2064
Atomic radius	A	2	.59	Heat of vaporization	kJ/mol	166	.4
Ionization Potential	V	5	.64	Heat of fusion	kJ/mol	8	.63
Electronegativity	-	1	.17	Specific heat	J/gK	0	.2
The oxide is mildly basic.				Crystal are rhombohedral.
Electron config. : [Xe] 4f⁶ 6s²
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131 1.2 sec EC/ECp,4.300 Pm-131/Nd-130 130.94494	132 4.0 sec EC/ECp,5.500 Pm-132/Nd-131 131.93991	133 3.7 sec EC/ECp,7.000 Pm-133/Nd-132 132.93870	134 10 sec EC,5.400 MeV Pm-134 133.93397	135 10.3 sec EC/ECp,7.200 Pm-135/Nd-134 134.93236	136 47 sec EC,4.500 MeV Pm-136 135.92828	137 45 sec EC,6.100 MeV Pm-137 136.92710
138 3.1 min EC,3.900 MeV Pm-138 137.92356	139 2.57 min EC,5.460 MeV Pm-139 138.92264	140 14.82 min EC,3.020 MeV Pm-140 139.91908	141 10.2 min EC,4.543 MeV Pm-141 140.91847	142 72.49 min EC,2.090 MeV Pm-142 141.91519	143 8.83 min EC,3.443 MeV Pm-143 142.91462	144 3.1% Stable 143.91199
145 340 da EC,2.322 MeV Pm-145 144.91340	146 10.3E+7 yr a,2.529 MeV Nd-142 145.91303	147 15.0% 1.06E+11 yr a,2.310 MeV Nd-143 146.91489	148 11.3% 7E+15 yr a,1.986 MeV Nd-144 147.91481	149 13.8% 2E+15 yr a,1.071 MeV Nd-145 148.91718	150 7.4% Stable 149.91727	151 90 yr B-,1.187 MeV Eu-151 150.91992
152 26.7% Stable 151.91972	153 46.27 hr B-,1.900 MeV Eu-153 152.92209	154 22.7% Stable 153.92220	155 22.3 min B-,1.627 MeV Eu-155 154.92463	156 9.4 hr B-,5.160 MeV Eu-156 155.92552	157 482 sec B-,2.730 MeV Eu-157 156.92835	158 5.30 min B-,1.999 MeV Eu-158 157.92998
159 11.37 sec B-,3.800 MeV Eu-159 158.93322	160 9.6 sec B-,3.000 MeV Eu-160 159.93515	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass