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Neptunium Np
Where is neptunium used--or where does it impact your everyday life?
Neptunium is a synthetic element--made in very small quantities
Neptunium is found in some smoke detectors AFTER the radioactive decay of americium-241.
24195Am --> 23793Np + 42He
The half-life of americium-241 is 458 years. After ~20 years, 3 % of the americium-241 has decayed to neptunium-237 with the production of alpha particles, 42He
Neptunium Np
Atomic mass: 237 Atomic #: 93
Where in the Periodic Table: Found in period 7, block f
Melting point: 644 oC (1191 oF)
Boiling point: 3900 oC (7052 oF)
Density: 20.2 g/mL
Most stable isotope: Neptunium-237
Other isotopes: Np-235, Np-236
Electron configuration: element 93 is [Rn] 5f4 6d1 7s2
LANL.gov nndc.bnl.gov
Researched by: Marianna I.
