Ce - Cerium

This rare earth element was named after the planetoid Ceres which was found the year before cerium was discovered, 1803, by Berzelius and Hisinger. Pure cerium was produced in 1875 by Hillebrand and Norton.

Atomic number - 58 Density g/mL 6 .78

Atomic weight u 140 .12 Melting point K 1071

Bonding radius A 1 .65 Boiling point K 3699

Atomic radius A 2 .7 Heat of vaporization kJ/mol 414

Ionization Potential V 5 .54 Heat of fusion kJ/mol 5 .46

Electronegativity - 1 .12 Specific heat J/gK 0 .19

The oxide is mildly basic.
Crystal are face centered cubic.

Electron config. : [Xe] 4f¹ 5d¹ 6s²

Isotopes of Ce: Click mass number for decay process, product for element page.

123
3.8 sec
EC/ECp,8.600
La-123/Ba-122
122.93548 124
6 sec
EC,5.600 MeV
La-124
123.93054 125
9.0 sec
EC/ECp,7.300
La-125/Ba-124
124.92850 126
50 sec
EC,4.400 MeV
La-126
125.92410 127
31 sec
EC,6.100 MeV
La-127
126.92270 128
3 min
EC,3.200 MeV
La-128
127.91884 129
3.5 min
EC,5.050 MeV
La-129
128.91808

130
25 min
EC,2.200 MeV
La-130
129.91468 131
10.2 min
EC,4.000 MeV
La-131
130.91443 132
3.51 hr
EC,1.290 MeV
La-132
131.91148 133
97 min
EC,2.900 MeV
La-133
132.91155 134
3.16 da
EC,3.710 MeV
La-134
133.90902 135
17.7 hr
EC,2.026 MeV
La-135
134.90914 136 0.19%

Stable

135.90714

137
9.0 hr
EC,1.222 MeV
La-137
136.90778 138 0.25%

Stable

137.90598 139
137.640 da
EC,2.317 MeV
La-139
138.90664 140 88.48%

Stable

139.90543 141
32.501 da
B-,2.502 MeV
Pr-141
140.90827 142 11.08%
5E+16 yr
2B-,4.505 MeV
Nd-142
141.90924 143
33.039 hr
B-,1.462 MeV
Pr-143
142.91238

144
284.893 da
B-,5.540 MeV
Pr-144
143.91364 145
3.01 min
B-,2.540 MeV
Pr-145
144.91722 146
13.52 min
B-,1.040 MeV
Pr-146
145.91873 147
56.4 sec
B-,3.290 MeV
Pr-147
146.92251 148
56 sec
B-,2.060 MeV
Pr-148
147.92439 149
5.3 sec
B-,4.190 MeV
Pr-149
148.92828 150
4.0 sec
B-,3.010 MeV
Pr-150
149.93023

151
1.02 sec
B-,5.400 MeV
Pr-151
150.93408 152
1.4 sec
B-,4.500 MeV
Pr-152
151.93633 MASS abund.
Halflife
Particle, Energy
Decay Product(s)
Isotopic Mass

Atomic number	-	58		Density	g/mL	6	.78
Atomic weight	u	140	.12	Melting point	K	1071
Bonding radius	A	1	.65	Boiling point	K	3699
Atomic radius	A	2	.7	Heat of vaporization	kJ/mol	414
Ionization Potential	V	5	.54	Heat of fusion	kJ/mol	5	.46
Electronegativity	-	1	.12	Specific heat	J/gK	0	.19
The oxide is mildly basic.				Crystal are face centered cubic.
Electron config. : [Xe] 4f¹ 5d¹ 6s²

123 3.8 sec EC/ECp,8.600 La-123/Ba-122 122.93548	124 6 sec EC,5.600 MeV La-124 123.93054	125 9.0 sec EC/ECp,7.300 La-125/Ba-124 124.92850	126 50 sec EC,4.400 MeV La-126 125.92410	127 31 sec EC,6.100 MeV La-127 126.92270	128 3 min EC,3.200 MeV La-128 127.91884	129 3.5 min EC,5.050 MeV La-129 128.91808
130 25 min EC,2.200 MeV La-130 129.91468	131 10.2 min EC,4.000 MeV La-131 130.91443	132 3.51 hr EC,1.290 MeV La-132 131.91148	133 97 min EC,2.900 MeV La-133 132.91155	134 3.16 da EC,3.710 MeV La-134 133.90902	135 17.7 hr EC,2.026 MeV La-135 134.90914	136 0.19% Stable 135.90714
137 9.0 hr EC,1.222 MeV La-137 136.90778	138 0.25% Stable 137.90598	139 137.640 da EC,2.317 MeV La-139 138.90664	140 88.48% Stable 139.90543	141 32.501 da B-,2.502 MeV Pr-141 140.90827	142 11.08% 5E+16 yr 2B-,4.505 MeV Nd-142 141.90924	143 33.039 hr B-,1.462 MeV Pr-143 142.91238
144 284.893 da B-,5.540 MeV Pr-144 143.91364	145 3.01 min B-,2.540 MeV Pr-145 144.91722	146 13.52 min B-,1.040 MeV Pr-146 145.91873	147 56.4 sec B-,3.290 MeV Pr-147 146.92251	148 56 sec B-,2.060 MeV Pr-148 147.92439	149 5.3 sec B-,4.190 MeV Pr-149 148.92828	150 4.0 sec B-,3.010 MeV Pr-150 149.93023
151 1.02 sec B-,5.400 MeV Pr-151 150.93408	152 1.4 sec B-,4.500 MeV Pr-152 151.93633	MASS abund. Halflife Particle, Energy Decay Product(s) Isotopic Mass