Protactinium tarimas:

/protactinium/

Protactinium audio:

Žodžio paaiškinimas anglų kalba:

• noun: A rare, extremely toxic, radioactive element chemically similar to uranium, having 13 known isotopes, the most common of which is protactinium 231 with a half-life of 32,480 years. Atomic number 91; melting point 1,230°C; specific gravity 15.37; valence 4, 5. See Table at element.

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protaktinis