protactinium

thorium$\longleftarrow$ 91 $\longrightarrow$uranium

Pronunciation

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

• Audio (US)

  (file)

• Hyphenation: prot‧ac‧tin‧i‧um

Noun

Singular protactinium

Plural none

Protactinium's place on the periodic table

The electron shell diagram for protactinium

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