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14 hours ago · Neptunium is a hard, silvery, ductile, radioactive actinide metal. In the periodic table, it is located to the right of the actinide uranium, to the left of the actinide plutonium and below the lanthanide promethium. [7] Neptunium is a hard metal, having a bulk modulus of 118 GPa, comparable to that of manganese. [8]
- a = 666.3b = 472.3c = 488.7
- Orthorhombic
- Pnma
- (α→β) 282 °C
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