Protactinium
Protactinium | |
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Atomic Number: 91 Atomic Weight: 231.03588 Melting Point: 1845 K (-259.34°C or -434.81°F) Boiling Point: unknown Density: 15.37 grams per cubic centimeter Phase at Room Temperature: Solid Element Classification: Metal Period Number: 7 Group Number: none Group Name: Actinide |