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protactinium
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nature : Periodic System III, vice ethnic communities actinide elements. A natural radioactive elements. Atomic number 91. Amu 231.03588. Density 15.37. 1600 ° C below the melting point. Protactinium 231 isotope of the longest half-life of about 3.4 × 104 years. Protactinium is a gray metal. With glossy and sexual extension. Hardness like uranium. Stability in the air. May 4 fluorinated protactinium PaF4 used as barium and reduction in the system. The chemical nature, protactinium and actinide elements no obvious similarities. It +4 compounds with similar neighboring thorium, and +5 compounds with niobium and tantalum is extremely similar.


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More Detailed Data:
1) Protactinium
2) protactinium
3) protoactinium;protactinium Pa
4) Actinium
5) actinium
6) actinium
7) actinium
8) actinium
9) protactinium 233
10) protactinium-ionium age dating method
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