WIKIPEDIA
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Protactinium |
Pa |
Greek |
πρῶτος + ἀκτίς |
first beam element |
descriptive? |
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Derived from former name
Protoactinium, from the Greek prefix proto- "first"
+ Neolatin "actinium" from Greek ἀκτίς (gen.:
ἀκτῖνος) "ray" + Latin -ium.[50] |
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