| Neptunium, Np | |
|---|---|
| Categories: | MetalNonferrous MetalPure Element |
| Material Notes: | Np-237 is the most stable isotope. Physical Form: Silver Metal |
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Export data to your CAD/FEA program| Physical Properties | Metric | English | Comments | ||
|---|---|---|---|---|---|
| Density | 20.48 g/cc | 0.7399 lb/in³ | from X-ray data | ||
| Chemical Properties | Metric | English | Comments | ||
| Atomic Mass | 237 | 237 | Longest-Lived Isotope (1995) | ||
| Atomic Number | 93 | 93 | |||
| X-ray Absorption Edge | 0.10487 Å | 0.10487 Å | K | ||
| 0.55314 Å | 0.55314 Å | LI | |||
| 0.57415 Å | 0.57415 Å | LII | |||
| 0.70391 Å | 0.70391 Å | LIII | |||
| Electronegativity | 1.3 | 1.3 | Pauling | ||
| Ionic Radius | 0.710 Å | 0.710 Å | Crystal Ionic Radius for Valence +7 | ||
| 0.950 Å | 0.950 Å | Crystal Ionic Radius for Valence +4 | |||
| 1.10 Å | 1.10 Å | Crystal Ionic Radius for Valence +3 | |||
| Mechanical Properties | Metric | English | Comments | ||
| Hardness, Vickers | 346 | 346 | |||
| Bulk Modulus | 118 GPa | 17100 ksi | |||
| Shear Modulus | 80.0 GPa | 11600 ksi | |||
| Electrical Properties | Metric | English | Comments | ||
| Electrical Resistivity | 0.000164 ohm-cm | 0.000164 ohm-cm | |||
| Thermal Properties | Metric | English | Comments | ||
| Heat of Fusion | 22.1 J/g | 9.51 BTU/lb | |||
CTE, linear  | 27.5 µm/m-°C @Temperature 40.0 – 240 °C | 15.3 µin/in-°F @Temperature 104 – 464 °F | Alpha Phase | ||
| 41.0 µm/m-°C @Temperature 278 – 530 °C | 22.8 µin/in-°F @Temperature 532 – 986 °F | Beta Phase | |||
| Specific Heat Capacity | 0.125 J/g-°C | 0.0299 BTU/lb-°F | Questionable Value | ||
| Melting Point | 637 °C | 1180 °F | |||
| Component Elements Properties | Metric | English | Comments | ||
| Neptunium, Np | 100 % | 100 % | |||
| Descriptive Properties | |||||
| CAS Number | 7439-99-8 | ||||
| Solubility | Soluble in HCl | ||||
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