protactinium

thorium${\displaystyle \longleftarrow }$ 91 ${\displaystyle \longrightarrow }$uranium

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Protactinium

Pronunciation

• (UK) IPA ^(key): /ˌprəʊ.tækˈtɪn.i.əm/
• (US) enPR: prō"tăktĭ'nēəm, IPA ^(key): /ˌproʊ.tækˈtɪn.i.əm/

• Audio (US)

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• Audio (US)

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• Hyphenation: prot‧ac‧tin‧i‧um

Noun

Singular protactinium

Plural none

1. (uncountable) A chemical element (symbol Pa) with atomic number 91.