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Isotope of protactinium
Nuclides with atomic number Z = 91 but with different mass numbers
Pronunciation
/ˈaɪsəˌtoʊp əv ˌproʊˌtækˈtiniəm/
/ˈʌɪsətəʊp əv ˌprəʊtakˈtɪnɪəm/
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isotope