136 Ce
135.907140 (50)
0.19 (2)
oxide
21 – 53+
138 Ce
137.905985 (12)
0.25 (2)
oxide
12 – 41+
140 Ce
139.905433 (4)
88.45 (51)
oxide
99+
142 Ce
141.909241 (4)
11.114 (51)
oxide
93 – 95+
Cerium Isotopes have limited applications at present. Ce-140 is often used for mass-cytometry studies, being the most naturally abundant isotope of Ce. Other Ce isotopes have limited laboratory uses.