Neptunium
93
Np
Gruppe
i/t
Periode
7
Blokk
f
Proton
Elektron
Nøytron
93
93
144
Generelle eigenskapar
Atomnummer
93
Atommasse
[237]
Massetal
237
Kategori
Aktinid
Farge
Sølv
Radioaktiv
Ja
Named after the planet Neptune
Krystallstruktur
Enkel ortorombisk
Historie
Neptunium was the first synthetic transuranium element of the actinide series to be discovered.
Neptunium was first produced by Edwin McMillan and Philip H. Abelson in 1940 at Berkeley Radiation Laboratory of the University of California.
The team produced the neptunium isotope 239Np by bombarding uranium with slow moving neutrons.
Neptunium was first produced by Edwin McMillan and Philip H. Abelson in 1940 at Berkeley Radiation Laboratory of the University of California.
The team produced the neptunium isotope 239Np by bombarding uranium with slow moving neutrons.
Elektron per energinivå
2, 8, 18, 32, 22, 9, 2
Elektronkonfigurasjon
[Rn] 5f4 6d1 7s2
Neptunium is obtained as a by-product from nuclear reactors
Fysiske eigenskapar
Tilstandsform
Fast stoff
Tettleik
20,45 g/cm3
Smeltepunkt
910,15 K | 637 °C | 1178,6 °F
Kokepunkt
4273,15 K | 4000 °C | 7232 °F
Smeltevarme
10 kJ/mol
Fordampingsvarme
335 kJ/mol
Spesifikk varmekapasitet
- J/g·K
Førekomst i jordskorpa
i/t
Førekomst i universet
i/t
CAS-nummer
7439-99-8
PubChem CID-nummer
i/t
Atom eigenskapar
Atomradius
155 pm
Kovalent radius
190 pm
Elektronegativitet
1,36 (Paulings skala)
Ioniseringspotensial
6,2657 eV
Molart volum
11,62 cm3/mol
Termisk konduktivitet
0,063 W/cm·K
Oksidasjonstrinn
3, 4, 5, 6, 7
Bruksområde
Neptunium is used mainly for research purposes.
When bombarded with neutrons 237Np is used to produce 238Pu which is used for spacecraft generators and terrestrial navigation beacons.
237Np is used in devices for detecting high-energy neutrons.
When bombarded with neutrons 237Np is used to produce 238Pu which is used for spacecraft generators and terrestrial navigation beacons.
237Np is used in devices for detecting high-energy neutrons.
Neptunium is harmful due to its radioactivity
Isotopar
Stabile isotopar
-Ustabile isotopar
225Np, 226Np, 227Np, 228Np, 229Np, 230Np, 231Np, 232Np, 233Np, 234Np, 235Np, 236Np, 237Np, 238Np, 239Np, 240Np, 241Np, 242Np, 243Np, 244Np