Yttrium 89 (89Y)
Yttrium 1
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Isotope of Yttrium
Neutrons 50
Protons 39
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Isotope mass 88.9058483(27)
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Discoverer Johan Gadolin
Location discovered Finland
Date discovered 1794

Yttrium 89 (89Y) is the only naturally occuring isotope of the element yttrium. It is commonly found in rare earth minerals and is hard to isolate.