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Isotopes of yttrium

Natural yttrium is composed of a single isotope yttrium-89. The most stable radioisotopes are ⁸⁸Y, which has a half-life of 106.6 days and ⁹ıY with a half-life of 58.51 days. All the other isotopes have half-lives of less than a day, except ⁸⁷Y,... Wikipedia
n: Neutron emission