Eu - Europium

There is no europium in our lab. Discovered by Demarçay in 1901.

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

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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 Eu: Click mass number for decay process, product for element page.

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 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 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 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 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 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 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

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 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	-	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
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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	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	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	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	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	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	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
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	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass