| 21. | The hydrolytic properties of pentavalent protactinium are close to those of tantalum ( V ) and niobium ( V ).
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| 22. | One process suggested for both separation of protactinium and the removal of the lanthanides is the contact with molten bismuth.
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| 23. | Fluorides, phosphates, hypophosphate, iodate and phenylarsonates of protactinium ( IV ) are insoluble in water and dilute acids.
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| 24. | He used two different procedures : in the first one, protactinium oxide was irradiated by 35 keV electrons in vacuum.
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| 25. | The new name meant " parent of actinium " and reflected the fact that actinium is a product of radioactive decay of protactinium.
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| 26. | Much smaller trace amounts of the short-lived nuclear isomer protactinium-234m occur in the decay chain of uranium-238.
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| 27. | Protactinium carbide PaC is formed by reduction of protactinium tetrafluoride with barium in a carbon crucible at a temperature of about 1400 �C.
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| 28. | Protactinium carbide PaC is formed by reduction of protactinium tetrafluoride with barium in a carbon crucible at a temperature of about 1400 �C.
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| 29. | The isotopes of neptunium range in atomic weight from 225.0339 protactinium, and the primary products after are isotopes of plutonium.
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| 30. | The most abundant, or easily synthesized actinides are uranium and thorium, followed by plutonium, americium, actinium, protactinium and neptunium.
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