Mendeleev's Periodic Table > Sm - Samarium

Sm - Samarium

Samarium was discovered by Lecoq de Boisbaudrain in 1879 in Paris. Samarium has a bright silver lustre and is reasonably stable in air. It ignites in air at 150°C. It is a rare earth metal. It is found with other rare earth elements in minerals including monazite and bastnaesite and is used in electronics industries.

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

Isotopes of Sm (Samarium):

MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	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
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	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
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	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
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	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
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	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
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	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
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	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
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	159 11.37 sec B-,3.800 MeV Eu-159 158.93322	160 9.6 sec B-,3.000 MeV Eu-160 159.93515

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