Protactinium
Автор:
Jesse Russell,Ronald Cohn, издатель:
"VSD", ISBN:
978-5-5106-5439-4
High Quality Content by WIKIPEDIA articles! Protactinium ( /?pro?t?k?t?ni?m/ PROH-tak-TIN-ee-?m) is a chemical element with the symbol Pa and atomic number 91. It is a dense, silvery-gray metal which readily reacts with oxygen, water vapor and inorganic ac
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