Assertion: hafnium's isotope | /r/HasProperty | zirconium-90 51.46 percent
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Source sentences:
text: Natural zirconium is a mixture of five stable isotopes: zirconium-90 (51.46 percent), zirconium-91 (11.23 percent), zirconium-92 (17.11 percent), zirconium-94 (17.40 percent), zirconium-96 (2.80 percent).