protactinium

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/ˌpɹəʊ.tækˈtɪn.i.əm/ English

Definitions

noun

A chemical element (symbol Pa) with atomic number 91: a dense, silvery-gray actinide metal.

Related words

Synonyms

protoactinium pa atomic number 91 actinium eka-protactinium palladium actinide plutonium uranium praseodymium tantalum astatine americium thorium phosphorus radium

References