Cerium is the most abundant rare earth metal. Pure cerium ignites when scratched by even a soft object. It has four known isotopes: 136Ce (atomic mass = 135.907 amu), 138Ce (atomic mass = 137.905 amu), 140Ce (atomic mass = 139.905 amu), and 142Ce (atomic mass = 141.909 amu). Ce-140 and Ce-142 are fairly abundant. Which is the more abundant isotope?
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