Mendeleev's Periodic Table > Eu - Europium

Eu - Europium

Europium, discovered by Demarçay in 1901, ignites in air at about 150 to 180°C. Europium is about as hard as lead and is quite ductile. It is the most reactive of the rare earth metals, quickly oxidising in air. It resembles calcium in its reaction with water. Europium is used in television screens to produce a red colour.

Atomic number	-	63		Density	g/mL	5	.26
Atomic weight	u	151	.96	Melting point	K	1090
Bonding radius	A	1	.85	Boiling point	K	1870
Atomic radius	A	2	.56	Heat of vaporization	kJ/mol	143	.5
Ionization Potential	V	5	.67	Heat of fusion	kJ/mol	9	.21
Electronegativity	-	1	.2	Specific heat	J/gK	0	.18
The oxide is mildly basic.				Crystal are body centered cubic.
Electron config. : [Xe] 4f⁷ 6s²

Isotopes of Eu (Europium):

MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	134 0.5 sec EC/ECp,5.400 Sm-134/Pm-133 133.94566	135 1.5 sec EC/ECp,8.700 Sm-135/Pm-134 134.94170	136 3.3 sec EC/ECp,10.400 Sm-136/Pm-135 135.93945	137 11 sec EC,7.500 MeV Sm-137 136.93515
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	138 12.1 sec EC,9.200 MeV Sm-138 137.93344	139 17.9 sec EC,6.700 MeV Sm-139 138.92979	140 1.51 sec EC,8.400 MeV Sm-140 139.92807	140a 125 msec EC,8.585 MeV Sm-140 139.92828
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	141 41.4 sec EC,5.550 MeV Sm-141 140.92443	142 2.4 sec EC,7.640 MeV Sm-142 141.92340	143 2.63 min EC,5.275 MeV Sm-143 142.92028	144 10.2 sec EC,6.315 MeV Sm-144 143.91877
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	145 5.93 da EC,2.660 MeV Sm-145 144.91626	146 4.59 da EC,3.878 MeV Sm-146 145.91720	147 24.1 da a/EC,1.722 Pm-143/Sm-147 146.91674	148 54.5 da a/EC,3.107 Pm-144/Sm-148 147.91815
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	149 93.1 da EC,1.071 MeV Sm-149 148.91792	150 36.9 yr EC,2.261 MeV Sm-150 149.91969	150a 12.8 hr EC,2.303 MeV Sm-150 149.91974	151 47.8% Stable 150.91984
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	152 13.537 yr B-/EC,1.874 Gd-152/Sm-152 151.92174	152a 9.3116 hr EC,1.920 MeV Sm-152 151.92178	153 52.2% Stable 152.92122	154 8.593 yr B-/EC,1.969 Gd-154/Sm-154 153.92297
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	155 4.7611 yr B-,1.627 MeV Gd-155 154.92288	156 15.19 da B-,2.451 MeV Gd-156 155.92475	157 15.18 hr B-,1.363 MeV Gd-157 156.92541	158 45.9 min B-,3.490 MeV Gd-158 157.92784
MASS abundancy Halflife Particle, Energy Decay Product(s) Isotopic Mass	159 18.1 min B-,2.514 MeV Gd-159 158.92908	160 38 sec B-,4.580 MeV Gd-160 159.93196	161 26 sec B-,3.700 MeV Gd-161 160.93365	162 10.6 sec B-,5.600 MeV Gd-162 161.93709

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