Assertion: occurring cerium | /r/HasProperty | 4 stable isotopes
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Source sentences:
text: Naturally occurring cerium ( 58 Ce) is composed of 4 stable isotopes: 136Ce, 138Ce, 140Ce, and 142Ce, with 140Ce being the most abundant (88.48% natural abundance) and the only one theoretically stable; 136Ce, 138Ce, and 142Ce are predicted to undergo double beta decay but this process has never been observed.