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Protactinium(Pa) Element
| Basic Infomation | |
Name: Protactinium Symbol: Pa Atomic Number: 91 Atomic Mass: 231.03587 amu Melting Point: 1600.0 °C (1873.15 °K, 2912.0 °F) Boiling Point: Unknown | Number of Protons/Electrons: 91 Number of Neutrons: 140 Classification: Rare Earth Crystal Structure: Orthorhombic Density @ 293 K: 15.4 g/cm3 Color: Unknown |
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