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. In out laboratory, cerium compounds may be observed with the emission spectrometer.

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

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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 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

Updated by clh on 2/6/98. This is not a publication of Phoenix College.