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Neptunium (Np) Element

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Basic Information
Name: Neptunium
Symbol: Np
Atomic Number: 93
Atomic Mass: (237.0) amu
Melting Point: 640.0 ??C (913.15 ??K, 1184.0 ??F)
Boiling Point: 3902.0 ??C (4175.15 ??K, 7055.6 ??F)
Number of Protons/Electrons: 93
Number of Neutrons: 144
Classification: Rare Earth
Crystal Structure: Orthorhombic
Density @ 293 K: 20.45 g/cm3
Color: Unknown

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