Quantum redactiones paginae "protactinium (en)" differant
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“Primum actinium.” Vide s.v. Latina '''[[protactinium]]'''.
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'''protactinium''' ''(materiale; symbolus:'' '''[[Pa]]''')
# '''[[protactinium]]''' ''(-ii, {{n}})'' || ''[[chemia|chem.]]'' Elementum 91.
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